在显微镜下观察草履虫时如果看不清纤毛，应该如何调节 [ ]
A．减小光圈
B．增大光圈
C．移动装片
D．使用凹面反光镜
答案：A
下列各题中有一处错误，请改正。
1. ---Do you usually come to school by bike? ---Yes, I am.
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2. Do you like watch TV?
3. She doesn't does housework on Saturday.
4. Amy usually listens music after supper.
5. I very like singing English songs.
6. What do you often do in Sunday evenings?
7. Do you enjoy chat with friends on the Internet?
8. Can he swims?
9. He studys at No.1 Middle School.
10. Tom, would you like to play with I?
什么是馏程？
