2. 外语
  3. The word "threatened" in the first sentence of the first paragraph could be best replaced by Why do researchers estimate elepha

The word "threatened" in the first sentence of the first paragraph could be best replaced by Why do researchers estimate elepha

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问题 The word "threatened" in the first sentence of the first paragraph could be best replaced by
Why do researchers estimate elephant numbers in an area by counting dung piles?
选项 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.
答案B
解析
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