2. 外语
  3. A mutation (is result) of a definite biochemical (change) in a gene that causes the offspring to vary in (some) characteristic (

A mutation (is result) of a definite biochemical (change) in a gene that causes the offspring to vary in (some) characteristic (

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问题 A mutation (is result) of a definite biochemical (change) in a gene that causes the offspring to vary in (some) characteristic (from) the parents.
选项 A、is result
B、change
C、some
D、from
答案A
解析
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