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问题 问答题

使用SDS分离DNA时，为什么要注意SDS的浓度

答案

参考答案：0.1%和1%的sDs的作用效果是不同的。前者只将RNA分离出来，后者可将DNA与RNA一起分离出来。

填空题

阅读下列每个句子，根据空白处的汉语提示或首字母，填入适当词汇。每空仅限一词。

1. Wang Wei soon got them _____ (感兴趣) in cycling too.

2. He looks old, but _____ (事实上) he is in his 30's.

3. He offered guidance to poor black people on their _____ (法律) problems.

4. One of my new classmates comes from an _____ (非洲) country.

5. Our _____ (政府) is caring more about the poor and the weak.

6. This is s_____ news as we never expected him to lose the game.

7. The books will be t_____ to Yushu by truck.

8. Workers built s_____ for survivors whose homes had been destroyed.

9. Different people have different a_____ toward the same thing.

10. He always buys gifts for us. So he behaves g_____.

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单项选择题

14岁女孩，半年来学习成绩下降，期中考试有一门功课不及格，受到父母责骂和同学歧视，渐渐情绪低落、恐慌、内疚、少言寡语、喜独处，思维渐迟钝。该女孩可能患（）

A.多动症

B.精神分裂症

C.抑郁症

D.焦虑症

E.孤独症
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