关于基因突变说法不正确的是()
A.基因突变定期发生在减数分裂过程
B.基因突变的频率很低
C.有些基因突变对生物体是有益的
D.基因突变是不定向的
参考答案:A
If I were you, I would _____ electricity. It is dangerous. [ ]
A. stay away from
B. keep far from
C. stay away
D. keep from