阅读理解。
When you have a cold, you must be unhappy (不快乐) because your body becomes hot, and there are
pains (疼痛) all over. You don't want to work, you stay in bed, feeling terrible.
What makes you ill? It's germs. Germs are everywhere. They are very small and you can't find them
with your eyes but you can see them with a microscope (显微镜). They are very small and there could be
hundreds of them in or on a very small thing.
Germs are always found in dirty water. When you look at dirty water under the microscope, you can
see them in it.
Germs are found not only in water. They are also found in air and dust (灰尘). If you cut your finger
(手指), and if some of the dust goes into the finger, it will become big and red, and you will have much
pain in it. Sometimes germs will go into your body and you will have pain everywhere.
1. The word germ means (意思是) ______.[ ]
A. 细菌
B. 废气
C. 煤气
D. 空气
2. You can see germs ______. [ ]
A. when you are ill
B. only when you use a microscope
C. when you cut your finger
D. everywhere around you
3. A microscope is used for ______. [ ]
A. making very big things look much smaller
B. making very small things look much bigger
C. helping you see things clearly
D. killing (杀死) germs
4. Your parents won't allow (允许) you to drink dirty water because ______. [ ]
A. dirty water will make you dirty
B. there are many germs in it and germs can make you ill
C. you can see many germs in it
D. it will make your finger red and big
5. The writer (作者) talks about ______. [ ]
A. how to keep dirty water clean
B. how to look after your fingers
C. how to find germs in the dirty water
D. what can make you ill
，得气体在状态A的压强PA=0.75atm；