题干

如图示某种农作物品种①和②培育出⑥的几种方法,有关说法错误的是(  )

A:经过Ⅲ培育形成④常用的方法是花药离体培养

B:过程Ⅵ常用一定浓度的秋水仙素处理④的幼苗

C:由品种①直接形成⑤的过程必需经过基因突变

D:由品种①和②培育品种⑥的最快途径是Ⅰ→Ⅴ

上一题 下一题 0.0难度 选择题 更新时间:2018-04-14 05:14:46

答案(点此获取答案解析)

D

同类题4

从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Advice for High School Students

    As a person who is graduating from high school very soon, I have some suggestions for students in high school or students who are soon going to be high school students.____ I am sure others can benefit from reading them and will not make similar mistakes like me.

    ____ Do not value first impression highly. Don't dismiss a person or an idea too early just because you immediately get a bad impression. You will miss many opportunities because of that.

    Although something seems bad at the first impression, it does not mean it is bad all the time. Try to give everything a fair chance.

    Don't try to please everybody. There is no way you can please everybody or get everybody to agree with you.____ It is a huge waste of time.

    Have respect for authority. No matter how much you may dislike them, just remember that teachers and parents care about you and they are only doing their jobs.____ Don't argue with them and just obey them.

    Realize a high school is not the real world. The real world isn't a closed environment. ____ What is rewarded in high school such as popularity and agreement is different from what is rewarded in the real world. If high school isn't working out for you, you may find yourself better at handling the real world.

A. Do not be too quick to judge.

B. So just learn to say the word “No” a lot.

C. Listen to their advice and consider it carefully.

D. Many of these are based on regrets that I have.

E. Bad habits are hard to break and remain with you for a long time.

F. Don't spend any effort trying to please others who will never like you.

G. It is a free society where people accept responsibility for their actions.