请大家参考哦！
1．题目：The word "threatened" in the first sentence of the first paragraph could be best replaced by
答案：A) "endangered".
2．题目：Why do researchers estimate elephant numbers in an area by counting dung piles?
答案：B) Because it's not possible to count elephants from a plane.
3．题目：Piles of dung can't be relied upon when it comes to estimating elephant numbers because
答案：C) they are different in the rate of decay.
4．题目：When researchers carry out a dung — pile census, according to Plumptre, the area selected should be
答案：D) so large that elephants can't move in and out of it freely.
5．题目：All of the following are indirect evidence EXCEPT
答案：A) trunks.
速记口诀：
不要轻信象类
1．威胁就是endangered ____________________
2．数象不行数粪堆____________________
3．腐烂率导致不可靠____________________
4．普查选择大地区____________________
5．直接证据是trunks ____________________ [综合类C, 理工类B，卫生类A]
