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题目内容
题目材料:
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 __________.
以上解析由 考满分老师提供。