下列哪种有害金属经甲基化后毒性增加（） A.镉 B.汞 C.铅 D.砷

Mr. White works in an office. He liked reading in bed when he was at school. It was bad for his eyes and now he is near-sighted. But he wouldn’t want anybody else to know about it and he never wears a pair of glasses. It often brings him some trouble.

One winter morning he was sent to a village school on business. He got off a bus at a stop in a small town. Then he had to walk there. The road to the village wasn’t smooth. There were stones here and there. He fell over several times and it made his clothes very duty. At last he got to the village. Suddenly it began to blow strongly and it got much colder. His hat was blown off while he was looking for the school. He had to run after it but he couldn’t catch it. He was wondering why his hat ran into a house as if it had legs. And then he ran into the house, too.

A big woman appeared and stopped him by shouting angrily, " What are you running after my hen for?"

小题1:According to the passage, which of the following is true?

A．Mr. White wears a pair of glasses.

B．Mr. White works in a village school.

C．Mr. White likes reading in bed in his office.

D．Mr. White often has some trouble because of his near sight.小题2: What was the weather like when Mr. White was walking to the village school?

A．It was warm.

B．It was windy.

C．It was fine.

D．It was cool.小题3:Mr. White couldn’t get his hat because ______.

A．his hat had legs

B．his hat was the big woman’s

C．he couldn’t see his hat at all

D．he couldn’t run as fast as his hat

Mr. Smith is ________a teacher. He is also our good friend.

A．only

B．more than

C．no more than

D．nor more than

古代雅典国家的最高权力机关是( )

A．元老院

B．五百人会议

C．公民大会

D．十 * * 委员会

对骨折伤员的现场急救，下列哪种做法是错误的（）

A、尽快对骨折复位处理

B、不应轻易搬动

C、对脊柱损伤的伤员，一定要让他的脊柱保持平直

D、进行现场急救的同时，拨打120

已知圆的半径R=3.145mm，运用有效数字的运算法则，求周长C（）

A.19.75mm

B.19.751mm

C.19.76mm

D.19.763mm