在光线明亮的实验室里，观察透明的口腔上皮细胞后再观察颜色较深

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问题单项选择题

在光线明亮的实验室里，观察透明的口腔上皮细胞后再观察颜色较深的黑藻叶片细胞，为便于观察，此时应（）

A.改用平面反光镜、缩小光圈

B.改用平面反光镜、放大光圈

C.改用凹面反光镜、缩小光田

D.改用凹面反光镜、放大光圈

答案

参考答案：D

填空题

单词拼写。

1. At last he __________(辞职) from his post and went back to Changsha.

2. The experiment he ____________(进行；实施) turned out to be a success.

3. John's ___________(雄心) is to swim across all the big rivers in the world.

4. The foreign visitors were _____________(陪同) to the airport.

5. He expressed his ________________(同情) when I failed in the exam.

6. The exhibition is held _______________(每年).

7. National ____________(界限) are becoming meaningless in the world.

8. The government suggested ______________(放弃) the research for lack of money.

9. We are trying to make politics more _____________(相关) to younger people.

10. They expected him to ______________(参加) in ceremony.

判断题

某公司将带有杀菌剂的航油加回了同一家航空公司的同一架飞机。