问题 单项选择题 A1型题

地方性氟中毒主要是由哪种因素引起的()

A.食物氟含量过高

B.土壤中氟含量过高

C.饮水氟含量过高

D.饮水氟含量过低

E.维生素A和钙缺乏

答案

参考答案:C

解析:在我国地方性氟中毒的病区类型有饮水型病区、燃煤污染型病区、饮茶型病区三种,其中饮水型病区分布最广,其特点是饮水中氟含量高于国家饮用水标准1.0mg/L,最高甚至可达17mg/L。所以饮水氟含量过高是地方性氟中毒的主要因素。答案选C。

选择题
阅读理解

Hobbs was an orphan(孤儿). He worked in a factory and every day he got a little money. Hard work changed him thin and weak. He wanted to borrow a lot of money to learn to paint pictures, but he did not think he could pay off the debts.One day the lawyer said to him, “One thousand dollars, and here is the money.” As Hobbs took the package of notes, he was very dumbfounded(目瞪口呆的). He didn’t know where the money came from and how to spend it. He said to himself, “I could go to find a hotel and live like a rich man for a few days; or I give up my work in the factory and do what I’d like to do: painting pictures I could do that for a few weeks, but what would I do after that? I should have lost my place of the factory and have no money to live on. If it were a little less money, I would buy a new coat, or a radio, or give a dinner to my friends. If it were more, I could give up the work and pay for painting pictures. But it’s too much for one and too little for the other.”

“Here is the reading of your uncle’s will(遗嘱),” said the lawyer, “telling what is to be done with this money after his death. I must ask you to remember one point. Your uncle has said you must bring me a paper showing exactly what you did with his money, as soon as you have spent it.”

“Yes, I see. I’ll do that.” said the young man.

小题1:He wanted to borrow money because he wanted to_____.

A.study abroad

B.work abroad

C.pay for the debts

D.learn to paint pictures小题2:Hobbs was dumbfounded on receiving the money because he thought_____.

A.the money was too much

B.the money was too little

C.he would be dismissed

D.the lawyer meant to punish him小题3:With the money he got, first Hobbs_____.

A.planned to have a happy life for a few days

B.decided to give up his work in the office

C.was to give a dinner to his friends

D.had no idea what to do小题4:What Hobbs was asked to do was_____.

A.to tell the lawyer what he did with the money after spending it

B.to read his uncle’s will

C.to tell the lawyer what was to be done with the money

D.nothing but to buy some pictures小题5:What Hobbs really loved to do was_____.

A.working in the factory

B.living in a fine hotel

C.painting pictures

D.saving the money