The book was written in 1946, the education system has witnessed great changes.A. when B. during whichC. since then D. since when 题目和参考答案——青夏教育精英家教网—

题目内容

The book was written in 1946, _________the education system has witnessed great changes.

A. when B. during which

C. since then D. since when

练习册系列答案

相关题目

阅读下列短文，从每题所给的四个选项（A、B、C、和D）中，选出最佳选项。

To extinguish (熄灭) different kinds of fires, several types of fire extinguishers have been invented. They must be ready for immediate use when fire breaks out. Most portable (手提式的) kinds operate for less than a minute, so they are useful only on small fires. The law requires ships, trains, buses and planes to carry extinguishers.

Since fuel, oxygen and heat must be present in order for fire to exist, one or more of these things must be removed or reduced to extinguish a fire. If the heat is reduced by cooling the material below a certain temperature, the fire goes out. The cooling method is the most common way to put out a fire. Water is the best cooling material because it is low in cost and easy to get.

Another method of extinguishing fire is by cutting off the oxygen. This is usually done by covering the fire with sand, steam or some other things. A blanket may be used to cover a small fire.

A third method is called separation, which includes removing the fuel, or material easy to burn, from a fire, so that it can find no fuel.

The method that is used to put out a fire depends upon the type of fire. Fires have been grouped in three classes. Fires in wood, paper, cloth and the like are called Class A fires. These materials usually help keep the fire on. Such fires can be stopped most readily by cooling with water.

1.If a fire breaks out on a bus, which of the follow should be ready there for you to use?

A. Sand. B. Water.

C. A blanket. D. An extinguisher.

2.To cover a small piece of burning wood with a basin(盆) in order to stop the fire is an example of ________.

A. cutting off the oxygen B. reducing the heat

C. removing the fuel D. separating the fire

3.In choosing how to put out a fire, we should first be clear about ________.

A. when it breaks out B. what kind it is

C. how it comes about D. where it takes place

4.What would the author probably discuss in the paragraph that follows?

A. Another type of extinguishers B. Another class of fires

C. How fires break out. D. How fires can be prevented.

Air pollution is caused by the following _________: about half of the problem is caused by vehicles.

Tom’s score on the test is the highest in the class. He _____.

A. should study last night

B. should have studied last night

C. must have studied last night

D. must study last night

What surprised me was not what he said but_______he said it.

A. the way B. in the way that

C. in the way D. the way which

Chan's restaurant on Baker Street,___________used to be poorly run, is now a successful business.

A. that B. which

C. who D. where

The Alibaba Group, _____was founded in 1999, has become China’s largest e-commerce company.

A. what B. which

C. whose D. whether

阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

Saturday, March 24th

We have arrived in the hot, wet city of Bangkok. This is our first trip to Thailand(泰国). All the different smells make us want to try the food. We are going to eat something special for dinner tonight. The hotel we are staying in is

cheap, and very clean. We plan to stay here for a few days, visit some places in

the city, and then travel to Chiang Mai in the North.

Tuesday, March 27th

Bangkok is wonderful and surprising! The places are interesting. We visited

the famous market which was on water, and saw a lot of fruits and vegetables.

Everything is so colorful, and we have taken hundreds of photos already! Later

today we will leave for Chiang Mai. We will take the train north, stay in

Chiang Mai for two days, and then catch a bus to Chiang Rai.

Friday, March 30th

Our trip to Chiang Rai was long and boring. We visited a small village in

the mountains. The village people here love the quiet life-no computers or

phones. They are the kindest people I have ever met. They always smile and say

"hello". Kathy and I can only speak a few words of Thai, so smiling is the best

way to show our kindness. I feel good here and hope to be able to come back

next year.

1.The diaries above show the writer's _____ days in Thailand.

A. 3 B. 7

C. 15 D. 30

2.It seems that visitors _____ in Bangkok.

A. often feel hungry

B. can always find cheap things

C. can’t take any photos

D. can enjoy themselves

3.Which of the following is TRUE?

A. Chiang Mai is a beautiful city in the south of Thailand.

B. The writer left Chiang Mai for Chiang Rai by bus.

C. Chiang Rai is a boring city in the mountains.

D. The writer is traveling alone in Thailand.

Little _______ that the region was rich in natural resources about four decades ago.

A. we did know B. knew we

C. did we know D. we knew

试题分类