问题 选择题

下列关于碳及其化合物的说法,正确的是(   )

A.碳和一氧化碳的还原性,可用于冶金工业

B.与金刚石、石墨一样,活性炭是碳的另一种单质

C.二氧化碳和一氧化碳都可以使动物死亡,所以都有毒性

D.CO2中混有少量的CO,可通过点燃混合气体的方法把CO转化为CO2

答案

答案:A

题目分析:A、性质决定用途,碳和一氧化碳的还原性,可用于冶金工业,正确,B、活性炭是石墨的微小晶体和少量杂质构成,不是碳的另一种单质,错误,C、二氧化碳和一氧化碳都可以使动物死亡,但二氧化碳是不能供给呼吸,并不是有毒,而一氧化碳有毒性,错误,D、二氧化碳既不燃烧也不支持燃烧,故CO2中混有少量的CO,不可通过点燃混合气体的方法把CO转化为CO2,错误,故选A

阅读理解

Have you ever had the strange feeling that you were being watched? You turned around and, sure enough, someone was looking right at you!

Parapsychologists (灵学家) say that humans have a natural ability to sense when someone is looking at them. To research whether such a“sixth sense”really exists, Robert Baker, a psychologist (心理学家) at the University of Kentucky, did two experiments.

In the first one, Baker sat behind unknowing people in public places and stared(盯着)at the backs of their heads for 5 to 15 minutes. The subjects(受试者)were eating, drinking, reading, studying, watching TV, or working at a computer. Baker made sure that the people could not tell that he was sitting behind them during those periods. Later, when he questioned the subjects, almost all of them said they had no sense that someone was staring at them.

For the second experiment, Baker told the subjects that they would be stared at from time to time from behind in a laboratory setting. The people had to write down when they felt they were being stared at and when they weren’t. Baker found that the subjects were no better at telling when they were stared at and when they weren’t.

Baker concludes that people do not have the ability to sense when they’re being stared at. If people doubt the outcome of his two experiments, said Baker,“I suggest they repeat the experiments and see for themselves.”

小题1:The aim of the two experiments is to ________.

A.explain when people can have a sixth sense

B.study how people act while being watched in the lab

C.study whether humans can sense when they are stared at

D.prove why humans have a sixth sense小题2:The underlined word “outcome” in the last paragraph most probably means ________.

A.value

B.result

C.performance

D.connection小题3:In the second experiment, the subjects _________.

A.could tell when they were stared at

B.could tell where they weren’t stared at

C.couldn’t tell who they were stared at or who they stared at

D.couldn’t tell when they were stared at or when they weren’t小题4:What can be learned from the passage?

A.People are born with a sixth sense.

B.The experiments support parapsychologists’ idea.

C.The subjects do not have a sixth sense in the experiments.

D.People have a sixth sense in all places.

判断题 案例分析题