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问题 单项选择题

患者男性56岁，牙周病晚期拟拔除，患糖尿病15年，规律服药控制饮食，血糖140mg/d1，尿糖（-），下列处理错误的是（）

A．目前患者状况可以考虑拔牙

B．此患者拔牙后易发生感染

C．术后应预防性使用抗生素

D．拔牙创内用碘仿纱条填塞

E．术前应预防性使用抗生素

答案

参考答案：D

解析：

填塞碘条并未起到预防感染发生的作用。

选择题

现代鸡的品种很多，但其祖先却都是同一种野生鸡--原鸡．原鸡的体重约为1千克，每年产卵8～12个，而现在的北京白鸡体重达3～4千克，每年产卵200多个．以上事实说明生物具有（　　）

A．生殖的特性

B．遗传的特性

C．变异的特性

D．遗传和变异的特性
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单项选择题

Industrial pollution is not only a problem for the countries of Europe and North America but also an extremely serious problem in some developing countries. For these countries, economic growth is a very important aim. They want to introduce industries, and so they put few controls on the industries which cause pollution.
Cubatao, an industrial town of 85 000 people in Brazil, is an example of the connection between industrial development and pollution. In 1954, Cubatao had no industry. Today it has more than twenty large factories, which produce many pollutants. The people of the town are suffering from the poisonous matter in their environment and the bad effects can be clearly seen. Birth shortcomings are extremely common. Among children and adults, lung problems are sometimes twelve times more common in Cubatao than in other places.
It is true that Brazil, like many other countries, has laws against pollution, but these laws are not enforced strictly enough. It is cheaper for companies to take no notice of the laws and pay the fines than to buy the expensive equipment that will reduce the pollution. It is clear, therefore, that economic growth is more important to the government than to the health of the workers. However, the responsibility does not completely lie with the Brazilian government. The example of Cubatao shows that international companies are not acting in a responsible way either. A number of the factories in the town are owned by large companies from France, Italy, and the US. They are doing things in Brazil that they would not be able to do at home. If they caused the same amount of pollution at home, they would be severely punished or even put out of business.

What is the author’s purpose in taking Cubatao as an example

A. To show that industry can develop very fast in developing countries.
B. To show that the pollution problem in Brazil is extremely serious.
C. To show that industrial growth can cause pollution problems for developing countries.
D. To show that pollution is killing many people and destroying the whole economy of Brazil.
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