下列有关叙述错误的是

题干

下列有关叙述错误的是

A：转基因技术产生的变异属于定向的基因重组

B：体细胞杂交技术是人为造成染色体变异的方法，它打破了自然界生殖隔离的限制

C：人工诱变能提高突变率，但没有改变基因的结构

D：经过诱变处理和人工选择的作用后的生物可变得更适合人类的需要

上一题下一题 0.0难度选择题更新时间:2020-02-13 03:05:17

C

Situations	Differences
Situations	Britons (英国人)	Americans
When being knocked into	They will say “sorry” before the other does.	They will ____ the person and expect him to say “sorry”.
When going out for dinner	They will ____ when going out for dinner.	They may wear a normal shirt to go to a good____.
When taking a taxi	They will give an address to the taxi driver and then ____.	They will ____ the taxi driver all the time.