Tiny Invaders
The human body is truly amazing. It allows us to sense the world around us, to do work and have fun, and to move from place to place. In fact, the human body does its work so well that most people don't think about it very much —until they get sick.
The germs (致病菌) that make people sick are eyerywhere. You can’t see them ，but they're there. They're sitting on your desk. They're hiding on your computers keyboard. They're even in the air that you are breathing. There are two types of germs: viruses and bacteria ( 细菌 ). Viruses are germs that can only live inside animals or plants. Viruses cause illnesses such as flu and measles ( 麻疹) . Bacteria are tiny creatures. Some bacteria are good. They can help your stomach break down food. Other bacteria aren't so good. They can make you sick.Bacteria can cause sore throats ( 喉痛) and ear infections.
How can you stop these tiny invaders from making you sick? Your skin is the first defense against germs. You can prevent some illnesses simply by washing with soap and water. But germs can still enter the body through small cuts in the skin or through the mouth, eyes, and nose.
Once germs are inside your body, your immune ( 免疫的) system tries to protect you. It looks for and destroys germs. How does it do that? Special cells patrol your body. Some of these cells actually eat germs! Other cells make antibodies. An antibody sticks to a germ. There is a different antibody for each kind of germ. Some antibodies keep germs from making you sick. Others help your body find and kill germs. After a germ is destroyed, the antibodies stay in your body. They protect you if the same kind of germ comes back. That way you will not get the same illness twice.
You can keep your body healthy by eating a nutritious ( 有营养的) diet to make your
immune system strong. You can also help your immune system fight germs by getting
vaccinated (接种) Vaccines are medicines. They contain germs that have been killed or
weakened. The dead germs can't make you sick. Instead, they cause your body to make
antibodies. If the same germ ever shows up again, then your antibodies attack it.
16. Viruses can only live inside people or animals.
A Right B Wrong C Notmentioned
17. All bacteria cause illnesses.
A Right B Wrong C Notmentioned
18. Washing your skin can prevent some illnesses.
A Right B Wrong C Notmentioned
19. Germs can enter the body through the eyes.
A Right B Wrong C Notmentioned
20. The heart contains the body's strongest muscle.
A Right B Wrong C Notmentioned
21. After they kill germs, antibodies stay in the body.
A Right B Wrong C Notmentioned
22 Vaccines can make you sick.
A Right B Wrong C Notmentioned
试题出处：http://www.examtiku.com/shiti/413703557.html
网考网参考答案：B、B、A、A、C、A、B
网考网解析：进入考试题库查看解析
大数据分析：根据网考网与考试题库的统计分析，该试题：
23%的考友选择了A选项
29%的考友选择了B选项
48%的考友选择了C选项
考友解析与评论：
· 题目都看不懂，整个就是乱蒙。
· 这一题我选择的是B、B、A、A、C、A、B
· 这个答案是有歧义
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