问题 填空题 案例分析题

2007年,陕西镇坪“华南虎”事件重新引起了人们对这种濒危生物的关注。华南虎(又称中国虎)是我国特有的亚种,全球只剩下不到100只,在野外生存的华南虎可能只有lO到30只。影响它们数量的首要原因是人虎冲突。一只虎至少需要15到30平方公里活动空间。近代的人口迅速增长,导致华南虎的栖息地碎裂化、岛屿化,很难满足华南虎的生存和繁殖的要求。第二个原因就是华南虎的很多食物是人类的经济动物,当人们的猎杀使这些动物的种群密度降低到一定程度时,华南虎已经很难生存。

华南虎和东北虎均为我国国家一级保护动物,它们属于一个物种的两个不同亚种。从进化的角度看,其差异的实质是种群()不同。

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参考答案:基因库

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     It is easy for many people to catch a cold in the springtime or fall. It makes us wonder if scientists

can send a man to the moon, why can't they find a cure for the common cold? The answer is easy.

There are actually hundreds of kinds of cold viruses out there. You never know which one you will

get, so there isn't a cure for each one.

     When a virus attacks your body, your body works hard to get rid of it. Blood rushes to your nose

and cause a block in it. You feel terrible because you can't breathe well, but your body is actually

eating the virus. Your temperature goes up and you get a fever, but the heat of your body is killing

the virus. You also have a runny nose to stop the virus from getting into your cells. You may feel very

uncomfortable, but actually your wonderful body is doing everything it can to kill the cold.

      Different people do different things to deal with colds. In the United States and some other

countries, for example, people might eat chicken soup to make themselves feel better. Some people

take hot baths and drink warm liquids. Other people take medicine to stop various symptoms (症状)

of colds.

      There is one interesting thing to note -some scientists say taking medicines when you have a cold

is actually bad for you. The virus stays in you longer because your body doesn't have a way to fight it

and kill it. Bodies can do an amazing job on their own. There is a joke, however, on taking medicine

when you have a cold. It goes like this:

     It takes about one week to get over a cold if you don't take medicine, but it takes only seven days

to get over a cold if you take medicine.

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