问题 问答题

2011年3月17,因日本福岛第一核电站发生核辐射泄漏,我国香港和内地出现抢购碘盐的疯狂热潮,用于防护核辐射.世界卫生组织提示要求谨慎服用碘片,以减少人体甲状腺吸收放射性碘.推荐每天服用量为100毫克碘元素.

如图为某加碘盐成分表:根据表中所给数值,回答下列问题:

每天食用______kg碘盐,我们才能从碘盐中吸收100mg碘元素.食用碘盐______(填“能”或“不能”)防治核辐射.

答案

设从碘盐中吸收100mg碘元素时,需要碘酸钾的质量为X,

127
214
×100%=100mg,

X=168.5mg,

则需要碘盐的质量为:168.5mg÷33.7mg/kg=5.0kg,

因为每个人每天食用的食盐不可能达到5.0kg,所以不能靠食用碘盐防治核辐射.

故填:5.0;不能.

阅读理解

阅读理解。

     A Russian, a Cuban, an American businessman and an American lawyer were on a train traveling across

England. The Russian took out a large bottle of vodka, gave each of the men a drink and then threw the rest

half bottle of vodka out of the window. "Why did you do that?" asked the American businessman. "There's

too much vodka in my country," said the Russian, "And really we have more than we will ever use." A little

later, the Cuban passed around fine Havana Cigars. Then he threw his out of the window. "I thought Cuba

is not a rich country," the businessman said. "But you threw that very good cigars out of the window!"

"Cigars," the Cuban answered, "are the cheapest in my country. We have more of them than we know what

to do with." The American businessman sat quietly for a moment. Then he got up, caught the lawyer by the

arm and threw him of the window.

1. The people in the story are from _____ countries.

A. one

B. two

C. three

D. four

2. The four people are traveling by _____.

A. bus

B. air

C. train

D. sea

3. Vodka is a kind of _____.

A. treasure (珍宝)

B. wine

C. food

D. medicine

4. The Russian and the Cuban both wanted to _____.

A. tell the businessman that their countries are rich

B. prove (证明) that they were rich

C. ask the two Americans to visit their countries

D. make the businessman happy

5. What did the businessman want to say by throwing the lawyer out of the window?

A. I want to buy some vodka.

B. We have too many lawyers in my country.

C. I'll go to Cuba and do some business of cigars.

D. If you need lawyers, come to America.

单项选择题 A1/A2型题