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Much of the world's cultivable land has high concentrations of aluminum in the soil. Because aluminum in soil can form compounds that damage grain plants' roots and drastically reduce yields, crop scientists are eager to find strains of grains that are aluminum tolerant. Finding a population of grain plants growing in aluminum-rich soil but producing high yields does not necessarily indicate that the plants belong to an aluminum-tolerant strain, however, since __________.

第1题

Which of the following most logically completes the passage?

A.even where the damaging aluminum compounds are absent, grain plants still require a variety of nutrients in order to yield well
B.high concentrations of some metallic elements other than aluminum can also damage grain plants' roots
C.the soil of some agricultural regions contains virtually no aluminum
D.any such population might have other unusual characteristics
E.the damaging aluminum compounds do not form unless the soil is acidic

E显示答案

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