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本题由chris提供
2878 次学习

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 pollinators 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?



    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 fruitproducing 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.


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答案:
C
亚洲,P树
非本地的,授粉人工完成,使得P树果实产量非常低。W是众所周知的P花的授粉者,当W 1980年被引入亚洲,P果实产量在一些地方增长了50%,但1984年产量大大下降; 解释题 A 在产量上升但需求下降后,P果实价格下降;无关,排 B 因为进口树没有原来的害虫或病害,进口树产量比本地树产量更高;违背题干事实,排 C 产量的快速增长往往耗尽树的营养,这些营养是产果的雌花需要的;营养耗尽导致1984产果下降,搭桥增强,正确 D 亚洲W数量在80和84年间保持同一水平; 无关,排 E 1980年前,P树的另一种授粉者没有后来的W授粉效率高;80年前的事,无关,排

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