题目内容
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[主观题]
Why do researchers estimate elephant numbers in an area by counting dung piles？A．Because e
Why do researchers estimate elephant numbers in an area by counting dung piles？
A．Because elephants are difficult to catch.
B．Because it is not possible to count elephants from a plane.
C．Because it is not possible to keep track of elephants.
D．Because elephants are shy animals.
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