问题 填空题

下列8个反应中,反应物中的有机物发生还原反应的是______,发生氧化反应的是______.

①由乙醇制取乙醛           ②由乙醛制取乙醇         ③乙醛的银镜反应 ④甲醛与新制的氢氧化铜反应  ⑤乙烯的水化     ⑥乙炔使高锰酸钾酸性溶液褪色 ⑦丙酮(CH3COCH3)与氢气生成2-丙醇         ⑧甲烷的燃烧反应.

答案

有机物发生的还有反应有C=C、C≡C、C=O与氢气的加成反应,如②⑦,

有机物发生的氧化反应有-OH、-CHO的催化氧化以及有机物与强氧化剂或有机物的燃烧等反应,本题中①③④⑥⑧为氧化反应,

乙烯的水化既不是氧化反应也不是还有反应,

故答案为:②⑦;①③④⑥⑧.

阅读理解

Have you winterized your horse yet? Even though global warming may have made our climate more mild, many animals are still hibernating(冬眠) .It’s too bad that humans can’t hibernate. In fact, as a species, we almost did.

Apparently, at times in the past , peasants in France liked a semi-state of human hibernation . So writes Graham Robb, a British scholar who has studied the sleeping habits of the French peasants. As soon as the weather turned cold people all over France shut themselves away and practiced the forgotten art of doing nothing at all for months on end.

In line with this, Jeff Warren, a producer at CBC Radio’s The Current, tells us that the way we sleep has changed fundamentally since the invention of artificial(人造的) lighting and the electric bulb.

When historians began studying texts of the Middle Ages, they noticed something referred to as “first sleep”, which was not clarified, though.  Now scientists are telling us our ancestors most likely slept in separate periods. The business of eight hours’ uninterrupted sleep is a modern invention.

In the past , without the artificial light of the city to bathe in, humans went to sleep when it became dark and then woke themselves around midnight. The late night period was known as ”The Watch” It was when people actually kept watch against wild animals ,although many of them simply moved around or visited family and neighbours .

According to some sleep researchers, a short period of insomnia(失眠) at midnight is not a disorder .It is normal . Humans can experience another state of consciousness  around their sleeping, which occurs in the brief period before we fall asleep or wake ourselves in the morning .This period can be an extraordinarily creative time for some people .The impressive inventor, Thomas Edison , used this state to hit upon many of his new ideas.

Playing with your sleep rhythms can be adventurous  ,as anxiety may set in. Medical science doesn’t help much in this case. It offers us medicines for a full night’s continuous sleep, which sounds natural ; however, according to Warren’s theory,it is really the opposite of what we need.

67.The example of the French peasants shows the fact that________.

A. people might become lazy as a result of too much sleep

B. there were signs of hibernation in human sleeping habits

C.people tended to sleep more peacefully in cold weather

D. winter was a season for people to sleep for months on end

68. The late night was called “The Watch”because it was a time for people______.

A. to set traps to catch animals

B. to wake up their family and neighbours

C. to remind others of the time

D.to guard against possible dangers

69. What does the author advise people to do ?

A. Sleep in the way animals do.

B.Consult a doctor if they can’t sleep.

C.Follow their natural sleep rhythm.

D.Keep to the eight-hour sleep pattern.

70.What is the author’s purpose in writing the passage?

A.To give a prescription for insomnia.

B.To urge people to sleep less.

C.To analyze the sleep pattern of modern people.

D.To throw new light on human sleep.

单项选择题