用免疫荧光技术直接法检测组织中的抗原，应将荧光素标记（）。 A.抗原 B.相应抗体

阅读理解。

     Everyone must go to bed early and get up early, or we won't be healthy and clever.

     Is this true? Perhaps it is. The body must have enough sleep. Children of your age need ten hours'

sleep every day. If you don't go to bed early, you won't have enough sleep. Then you can't think properly

and can't do your work properly. You'll not be clever.

     Some people go to bed late and get up late. This is not good for them. We must sleep at night when it

is dark. The dark helps us to sleep soundly. When the daytime comes, we must get up. This is the time for

exercise. If you lack exercise, the body becomes weak.

     Exercise keeps a strong body. Exercise helps the blood (血液) flow (流动) around inside the body. This

is very important. Blood takes food to all parts of our body. The brain also needs blood. We think with our

blood. If we keep our body healthy and take exercise, we can think better.

1. If we want to be healthy and clever, we must go to bed _____.

A. late and get up early

B. early and get up late

C. early and get up early

D. late and get up late

2. Children of your age need _____.

A. ten hours' sleep

B. nine hours' sleep

C. twelve hours' sleep

D. eleven hours' sleep

3. The best time to sleep is when _____.

A. daytime comes

B. it is dark

C. we are taking exercise

D. it is late afternoon

4. Exercise makes the body _____.

A. weak

B. clever

C. active

D. strong

5. Exercise _____.

A. makes more blood

B. helps the blood to flow

C. makes food for our blood

D. makes our brain tired

潜育期

有下列四种物质：①无水硫酸铜 ②氢氧化钠溶液 ③稀硫酸 ④硝酸银溶液．根据题意把正确答案的序号填入空格内：

（1）除去CO中混有的少量CO₂可以用______；

（2）鉴别NaCl溶液和KNO₃溶液可以用______；

（3）证明H₂中含有水蒸气可以用______；

（4）研究Zn和Cu金属活动性可以用______．

国朝文派

当项目需要加速完成，又不能打断日常运营活动时，应该选择矩阵结构。