题目内容
患者，女性，70岁，高血压病史20年。半年来，血压控制较差，反复于活动后出现心慌、气短。2天来，受凉后出现发热、咳嗽、咳痰，活动耐力下降，如厕及床边活动即可引起心慌、气短。目前该患者的心功能属于
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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 everywhere. You can't see them, but they're there. They're sitting on your desk. They're hiding on your computer's 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 germsl 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 sys- tem 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.
Viruses can only live inside people or animals
某投资者以20元1股的价格买入W公司股票，持有1年分得现金股息1．80元，则股利收益率为（）。
投资人可在规定的时间和场所向基金公司申购和赎回的基金被称为（）。
在中国境外注册，在香港上市，但是主要业务在中国内地或者大部分股东权益来自中同内地的股票叫作（）。
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