题目内容

基因突变的原因有()

A. 自发突变
B. 物理因素
C. 化学因素
D. 生物因素

查看答案
更多问题

It was John to whom I sent the book.

Sam is in what a difficult position!

Nothing the poor boy could say against Joe.

The weather be what it may, I will go out.

答案查题题库