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Because gold is very dense, with a letter 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 side. This expert expresses that gold is___ 

A. an expensive metal 
B. pan is very skilled in fidig gold with right speed 
C. particles and gold are found together 
D. gold drives particle out 
E. particles make gold worn out 
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সঠিক উত্তরঃ D. gold drives particle out 
Explanation: