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题目材料：
Self-pollinating plants carry several advantages over those plants that are non–self-pollinating. For one, self-pollinating plants still produce the same number of seeds during drought conditions, when the number of insects-which aid in the spread of seeds of non–self-pollinating plants-is low. Self-pollinating plants are also able to thrive in a greater variety of climates. Nonetheless, the number of self-pollinating plants in the world is much lower than that of non–self-pollinating plants.
Which of the following, if true, could account for the discrepancy described in the paragraph above?
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AA wide variety of insects, any of which can experience dwindling numbers during drought years, disperse the seeds of non–self-pollinating plants.
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BNon–self-pollinating plants release larger seeds that have a far greater chance of germinating than those formed by self-pollinating plants.
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CDuring non-drought years, non–self-pollinating plants do not create more seeds than do self-pollinating plants.
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DInsects sometimes spread the seeds released by self-pollinating plants but such seeds rarely germinate.
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ENon–self-pollinating plants thrive in tropical parts of the world more readily than do self-pollinating plants.
B显示答案
