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问题 选择题

孟德尔的豌豆杂交实验中，将纯种的黄色圆粒(YYRR)与纯种的绿色皱粒(yyrr)豌豆杂交，F2代种子为480粒，从理论上推测，基因型为YyRR的个体数大约是 [ ]

A．60粒

B．30粒

C．120粒

D．240粒

答案

答案：A

填空题

根据句意和汉语提示写出单词的正确形式。

1. In the afternoon they went to all exhibition of ________ (现代) art.

2. A man from Canada spent a summer in our ________ (村子).

3. Most of them were surprised to hear my ________ (决定).

4. — When did Columbus ________ (发现) America?

    — In 1492.

5. Children of all ages should be outdoors ________ (几个) hours a day.

6. People think it is ________ (无礼) to talk loudly in public places.

7. Never ________ (争吵) with your parents or teachers. Be polite to them.

8. The girl felt nervous ________ (尤其) when the teacher asked her questions.

9. I think kids should learn to plan things for ________ (自己).

10. Wang Lin has a ________ (俄罗斯) pen pal, and my pen pal is from Australia.

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单项选择题

对无尿潴留的癃闭患者应怀疑

A．肾结核
B．电解质紊乱
C．饮水少
D．肾功能衰竭
E．多囊肾
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