Living things are______cells, and cells do not grow to more than twice the size

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问题 Living things are______cells, and cells do not grow to more than twice the size they were at first.

选项 A、made from
B、made up of
C、made up from
D、made of

答案 B

解析 be made up of“由……组成”．be made of“由……制成(看得出原材料)"；be made from“由……制成(看不出原材料)"。句意为：生物由细胞组成，细胞不会生长到原来大小的两倍。

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