Don't Count on Dung
    1.題目：The word "threatened" in the first sentence of the first paragraph could be best replaced by
    答案：A) "endangered".
    2.題目：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.題目：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.題目：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.題目：All of the following are indirect evidence EXCEPT
    答案：A) trunks.
    速記口訣：
    不要輕信象類
    1.威脅就是endangered ____________________
    2.數(shù)象不行數(shù)糞堆____________________
    3.腐爛率導致不可靠____________________
    4.普查選擇大地區(qū)____________________
    5.直接證據(jù)是trunks ____________________