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

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

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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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