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It can be inferred from the passage that which of the followings is true about Asterionella plants in Lake Windermere?
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A.They are not present except in early spring.
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B.They contribute silica to the waters as they grow.
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C.They are food for other organisms.
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D.They form a silica-rich layer on the lake bottom.
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E.Their growth peaks in the spring.
E显示答案
