Choose the best answer from the options. What is the meaning of ‘a hard nut to crack’?

What Punctuation Mark is used before a list of names or an enumeration of particulars:

[{"text": "Read the passage and answer the Q. (26-31)[E-40, DU-B : 2001-02]"}, {"question": "", "options": [{"option": "We think life is meaningless", "answer": false}, {"option": "We are too tired", "answer": false}, {"option": "We give more importance to death", "answer": false}, {"option": "We do not realize the value of life", "answer": true}], "type": "question", "database_type": "qb", "university": "du", "year": "2001-02", "unit": "b", "shift": "", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "According to the writer we do not pay attention to life beacause-", "full_question": "'Buoyant health' means-", "mark": 1.0, "answer": "one", "explanation": "'Buoyant health' means-[E-40, DU-B : 2001-02]"}, {"question": "", "options": [{"option": "to punish them for their sins", "answer": false}, {"option": "to help understanding the deaf and the blind", "answer": false}, {"option": "to help people appreciate the benefits of sight and sound", "answer": true}, {"option": "to bring darkness and silence in the world", "answer": false}], "type": "question", "database_type": "qb", "university": "du", "year": "2001-02", "unit": "b", "shift": "", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "Why will it be a blessing for people to become deaf and blind for a few days?", "full_question": "The main purpose of this passage is to", "mark": 1.0, "answer": "one", "explanation": "The main purpose of this passage is to

[{"text": "What is the main topic of the passage?", "mark": 1.0, "answer": "one", "explanation": "What is the main topic of the passage?[E-40,\u00a0JU-F2 : 2016-17]"}, {"question": "", "options": [{"option": "upward", "answer": false}, {"option": "downward", "answer": false}, {"option": "toward the right", "answer": false}, {"option": "toward the left", "answer": true}], "type": "question", "database_type": "qb", "university": "ju", "year": "2016-17", "unit": "f", "shift": "2", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "According to the passage, a person who is right-handed is more likely to draw people and animals that are facing-", "full_question": "In the last paragraph, the words \"the picture\" refer to which of the following?", "mark": 1.0, "answer": "one", "explanation": "In the last paragraph, the words \"the picture\" refer to which of the following?[E-40,\u00a0JU-F2 : 2016-17]"}]

[{"text": "Three passions, simple, but overwhelmingly strong, have governed my life: the longing for love, the search for knowledge, and unbearable pity for the sufferings of mankind.Love and knowledge, as far as they were possible, led upward toward the heavens. But always pity bought me back to earth. Echoes of cries of pain reverberate in my heart. Children in famine, victims tortured by oppressors, helpless old people a hated burden to their sons, and the whole world of loneliness, poverty, and pain make a mockery of what human life should be. I long, to alleviate the evil, but I cannot, and I too suffer.", "type": "text_block", "database_type": "", "university": "", "year": "", "unit": "", "shift": "", "subject": "", "chapter": "", "topic": ""}, {"question": "", "options": [{"option": "Long for love", "answer": true}, {"option": "Search for knowledge\u00a0", "answer": false}, {"option": "Pity for the sufferings of mankind\u00a0", "answer": false}, {"option": "Not given\u00a0", "answer": false}], "type": "question", "database_type": "qb", "university": "ju", "year": "2012-13", "unit": "f", "shift": "2", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "To the writer, which one is the strongest passing?", "full_question": "The word 'Unfathomable' means -", "mark": 1.0, "answer": "one, shuffle", "explanation": "The word 'Unfathomable' means -[E-40,\u00a0JU-F2 : 2012-13]"}, {"question": "", "options": [{"option": "Failure in study\u00a0", "answer": false}, {"option": "Betrayal in love", "answer": false}, {"option": "Suffering if mankind\u00a0", "answer": true}, {"option": "Fear of death\u00a0", "answer": false}], "type": "question", "database_type": "qb", "university": "ju", "year": "2012-13", "unit": "f", "shift": "2", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "What brings the writer back to reality?", "full_question": "

Which one is mentioned here as the oldest institution of Rajshahi?

[{"text": "[E-40,\u00a0JU-C4 : 2012-13]"}, {"question": "", "options": [{"option": "Classical Literature\u00a0", "answer": false}, {"option": "European Theatre", "answer": false}, {"option": "Nigerian Folklore\u00a0", "answer": true}, {"option": "Mediterranean Folklore Literature", "answer": false}], "type": "question", "database_type": "qb", "university": "ju", "year": "2012-13", "unit": "c", "shift": "4", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "What is the sauce of his play 'The road'?", "full_question": "What was \"A dance of the forest\" performed?\u00a0", "mark": 1.0, "answer": "one", "explanation": "What was \"A dance of the forest\" performed?\u00a0[E-40,\u00a0JU-C4 : 2012-13]"}]

. Which is the example of Direct Tax?

[{"text": "Recently, significant problems regarding energy use have emerged. Enormous amounts of pollutants are being emitted from power plants, factories, and automobiles, which are worsening the condition of the earth. This environmental degradation is a clear result of acid rain, increased levels of carbon dioxide in the atmosphere, and other forms of air pollution. Acid rain and air pollution, for instance, are devastating forests, crops, and lakes over wide areas all over the world. Since the 1950s, carbon dioxide levels in the atmosphere have increased by 13%, setting the stage for global warming. As atmospheric temperature rise, grain output may significantly decrease, making it more difficult for farmers to keep pace with the growth of population. In urban areas, air pollution is taking a toll on the buildings and human health. To reduce the amount of environmental damage in cities, developed countries have devised technology to control the harmful emissions. However, as these countries already have an abundance of vehicles that continue to grow in number, the efficacy of these measures is diminished. Since cars and other vehicles create more air pollution than any other human activity, the most effective means to reduce pollution is to decrease the number of vehicles. A major shift away from automobile usage in urban areas may be possible with the aid of urban planning.", "type": "text_block", "database_type": "", "university": "", "year": "", "unit": "", "shift": "", "subject": "", "chapter": "", "topic": ""}, {"question": "", "options": [{"option": "the role of pollutants is increasing air pollution all over the world.", "answer": false}, {"option": "hazardous effects of air pollution and the role of urban planners in improving living conditions.\u00a0", "answer": true}, {"option": "the devastating effect of acid rain of forest resources, crops and water bodies", "answer": false}, {"option": "the extensive use of cars and vehicles is diminishing the growth of a risk-free society.\u00a0", "answer": false}], "type": "question", "database_type": "qb", "university": "du", "year": "2014-15", "unit": "a", "shift": "", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "The passage is about :", "full_question": "The word 'pollutants' in the passage is a/an", "mark": 1.0, "answer": "one", "explanation": "The word 'pollutants' in the passage is a/an[E-31, DU-A : 2014-15]"}, {"question": "", "options": [{"option": "being expensive\u00a0", "answer": false}, {"option": "casusing a barrier", "answer": false}, {"option": "causing damage", "answer": true}, {"option": "\u00a0ringing a bell", "answer": false}], "type": "question", "database_type": "qb", "university": "du", "year": "2014-15", "unit": "a", "shift": "", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "\" taking a toll \" in the passage means :", "full_question": "What happens with the increase in the atmospheric temperature?\u00a0", "mark": 1.0, "answer": "one", "explanation": "What happens with the increase in the atmospheric temperature?\u00a0[E-31, DU-A : 2014-15]"}]

[{"text": "to get rid of all the refuse the disposal of various kind of\u00a0Man makes fire to cook food, make bricks, melt tar for\u00a026. Domestic Rubbish is problematic, because-\u00a0", "mark": 1.0, "answer": "one", "explanation": "26. Domestic Rubbish is problematic, because-\u00a0[E-40,\u00a0JU-C2 : 2011-12]"}, {"question": "", "options": [{"option": "man makes fire for domestic need\u00a0", "answer": false}, {"option": "fire is not needed for building construction\u00a0", "answer": true}, {"option": "fire pollutes the air", "answer": false}, {"option": "fire is used during road construction\u00a0", "answer": false}], "type": "question", "database_type": "qb", "university": "ju", "year": "2011-12", "unit": "c", "shift": "2", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "28. According to the passage,\u00a0 which statement is false\u00a0", "full_question": "29. Air pollution is the result of Man's desire to be :", "mark": 1.0, "answer": "one", "explanation": "29. Air pollution is the result of Man's desire to be :[E-40,\u00a0JU-C2 : 2011-12]"}]

[{"text": "The aim the writer is to persuade the reader that-", "mark": 1.0, "answer": "one", "explanation": "The aim the writer is to persuade the reader that-[E-40,\u00a0DU-B : 2013-14]"}, {"question": "", "options": [{"option": "There is not enough repect for authority", "answer": false}, {"option": "There is not enough memorization", "answer": false}, {"option": "There is too much stress on creativity", "answer": true}, {"option": "There is a shortfall of discipline", "answer": false}], "type": "question", "database_type": "qb", "university": "du", "year": "2013-14", "unit": "b", "shift": "", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "Which is a criticism of Western upbringing made by the writer?", "full_question": "The phrase \"on the other hand\"is used to signal that the writer will-", "mark": 1.0, "answer": "one", "explanation": "The phrase \"on the other hand\"is used to signal that the writer will-[E-5, DU-B : 2014-15]"}, {"question": "", "options": [{"option": "did Fleming invent", "answer": true}, {"option": "Fleming invented", "answer": false}, {"option": "Fleming invents", "answer": false}, {"option": "hal Fleming invented", "answer": false}], "type": "question", "database_type": "qb", "university": "du", "year": "2014-15", "unit": "b", "shift": "", "subject": "e-a", "chapter": "e-19", "topic": "", "title": "When ---- Penicillin?", "full_question": "The word \"Outperform\" means-", "mark": 1.0, "answer": "one", "explanation": "The word \"Outperform\" means-

[{"text": "", "type": "text_block", "database_type": "", "university": "", "year": "", "unit": "", "shift": "", "subject": "", "chapter": "", "topic": ""}, {"question": "", "options": [{"option": "The bodies of water of the world", "answer": false}, {"option": "The elements of salt", "answer": false}, {"option": "The many forms of ocean water", "answer": false}, {"option": "The salinity of ocean water", "answer": true}], "type": "question", "database_type": "qb", "university": "ju", "year": "2020-21", "unit": "b", "shift": "2", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "What does the passage mainly discuss?", "full_question": "According to the passage, the ocean generally has more salt in\u00a0\u00a0 \u00a0 \u00a0", "mark": 1.0, "answer": "one", "explanation": "According to the passage, the ocean generally has more salt in\u00a0\u00a0 \u00a0 \u00a0[E-40,\u00a0JU-B2 : 2020-21]"}, {"question": "", "options": [{"option": "The salt remains in the water", "answer": false}, {"option": "The surrounding water sinks\u00a0", "answer": false}, {"option": "Water salinity decreases\u00a0", "answer": true}, {"option": "The water becomes denser\u00a0", "answer": false}], "type": "question", "database_type": "qb", "university": "ju", "year": "2020-21", "unit": "b", "shift": "2", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "Which of the following is NOT a result of the formation of ocean ice?", "full_question": "What can be inferred about the water near the bottom of oceans?", "mark": 1.0, "answer": "one", "explanation": "What can be inferred about the water near the bottom of oceans?

Human lives ____.

The philosopher claimed that a person who must consciously ........his or her own indifference before helping another is behaving more nobly than one whose basic disposition such an act to be performed without.............

[{"text": "[E-40,\u00a0JU-B3 : 2016-17]"}, {"question": "", "options": [{"option": "World Bank", "answer": false}, {"option": "Zoological Society of London", "answer": true}, {"option": "UNESCO", "answer": false}, {"option": "Activist researchers", "answer": false}], "type": "question", "database_type": "qb", "university": "ju", "year": "2016-17", "unit": "b", "shift": "3", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "A major study was conduced by-", "full_question": "The theme of the piece is-", "mark": 1.0, "answer": "one", "explanation": "The theme of the piece is-[E-40,\u00a0JU-B3 : 2016-17]"}, {"question": "", "options": [{"option": "Tourist area", "answer": false}, {"option": "Scenic beauty", "answer": false}, {"option": "Research spot", "answer": false}, {"option": "Natural shiled", "answer": true}], "type": "question", "database_type": "qb", "university": "ju", "year": "2016-17", "unit": "b", "shift": "3", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "The Sundarbans may be seen as a ________.", "full_question": "

Because gold is very dense, with a little skill the pan could be swirled at just the right speed to allow the gold to settle to the bottom of the pan, while the dirt and low-density particles would wash over the slide. This excerpt expresses that gold is-

[{"text": "[E-40,\u00a0JU-C7 : 2013-14]"}, {"question": "", "options": [{"option": "Paharpur is the 2nd largest Buddhist monastery in Asia", "answer": false}, {"option": "\u00a0Paharpur is the 2nd largest Buddhist monastery in south-east-Asia", "answer": false}, {"option": "Paharpur is the 2nd largest single Buddhists monastery in south-east-Asia", "answer": false}, {"option": "Paharpur is the 2nd largest Buddhist monastery in the Himalayas", "answer": true}], "type": "question", "database_type": "qb", "university": "ju", "year": "2013-14", "unit": "c", "shift": "7", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "According to the passage, which statement is true?", "full_question": "According to the passage, the design of the monastery is like-", "mark": 1.0, "answer": "one", "explanation": "According to the passage, the design of the monastery is like-

[{"text": "Lorry-driver : I was driving from the airport towards Newtown. A cat ran across the road, so I slowed down. I did not stop. A taxi hit the back of my lorry. Nobody was seriously injured but both vehicles were damaged.As a result of the accident -", "mark": 1.0, "answer": "one", "explanation": "As a result of the accident -[E-40, DU-A : 2005-06]"}, {"question": "", "options": [{"option": "The lorry - driver\u00a0", "answer": false}, {"option": "two car approaching from Newtown\u00a0", "answer": false}, {"option": "The taxi - driver\u00a0", "answer": true}, {"option": "the cat", "answer": false}], "type": "question", "database_type": "qb", "university": "du", "year": "2005-06", "unit": "a", "shift": "", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "The accident was probably caused by -", "full_question": "The taxi - driver said that -", "mark": 1.0, "answer": "one", "explanation": "The taxi - driver said that -[E-40, DU-A : 2005-06]"}]

[{"text": "The paragraph is concerned with -", "mark": 1.0, "answer": "one", "explanation": "The paragraph is concerned with -[E-4,\u00a0JU-B1 : 2017-18]"}, {"question": "", "options": [{"option": "Fish hook", "answer": false}, {"option": "Hatchet", "answer": true}, {"option": "Bow and arrow", "answer": false}, {"option": "Pottery\u00a0", "answer": false}], "type": "question", "database_type": "qb", "university": "ju", "year": "2017-18", "unit": "b", "shift": "1", "subject": "e-b", "chapter": "e-40", "topic": "", "title": "Which of the following was developed earliest?", "full_question": "Which of the following developments is not related to Ice Age?", "mark": 1.0, "answer": "one", "explanation": "Which of the following developments is not related to Ice Age?[E-40,\u00a0JU-B1 : 2017-18]"}]

Choose the word which fits best within the texts below. Among , 12-years old have on average only three missing, decayed or filled teeth.

Throughout history, the search for salt has played an important role in society. Where it was scarce, salt was traded ounce for ounce with gold. Rome′s major highway was called the via salaria, that is the Salt road. Along the road, Roman soldiers transported salt crystals from the salt flats at Ostia up the Tiber River. In return, they received a salarium or salary, which was literally money paid to soldiers to buy salt. The old saying ‘worth their salt′. Which mean to be valuable derives from the custom of payment during the Empire.According to the passage salt flats were located in−