Critical Reasoning
试题详情
题目：
In Asia, where palm trees are non-native, the trees' flowers have traditionally been pollinated by hand, which has kept palm fruit productivity unnaturally low. When weevils known to be efficient pronators of palm flowers were introduced into Asia in 1980, palm fruit productivity increased— by up to 50 percent in some areas—but then decreased sharply in 1984.
Which of the following statements, if true, would best explain the 1984 decrease in productivity?
Which of the following statements, if true, would best explain the 1984 decrease in productivity?
选项:
A、Prices for palm fruit fell between 1980 and 1984 following the rise in production and a concurrent fall in demand.
B、Imported trees are often more productive than native trees because the imported ones have left behind their pests and diseases in their native lands.
C、Rapid increases in productivity tend to deplete trees of nutrients needed for the development of the fruit-producing female flowers.
D、weevil population in Asia remained at approximately the same level between 1980 and 1984.
E、Prior to 1980 another species of insect pollinated the Asian palm trees, but not as efficiently as the species of weevil that was introduced in 1980
答案:
C
提问：
这个题我选的D，w虫的数量保持不变。
我是这样想的：棕榈果实产量增长有两种可能，一种是增加了棕榈树的数量，一种是增加了单株产量。所以，如果是第一种方式那么应该选d，没有更多的w来传粉；如果是第二种方式，我觉得选c，养分不足。
最后我犹豫了一下选了D。。。。。。
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