The novel coronavirus pneumonia (NCP) has already made tens of thousands of people sick. Where did the virus come from? Scientists say it probably came from bats.Bats can carry and transmit more than 题目和参考答案——青夏教育精英家教网—

题目内容

The novel coronavirus pneumonia (NCP) has already made tens of thousands of people sick. Where did the virus come from? Scientists say it probably came from bats.

Bats can carry and transmit more than 60 viruses that can infect humans， Live Science noted. They include the world’ s deadliest viruses，such as Ebola and HIV. Due to their strong immune systems (免疫系统)，bats are able to host these viruses and not get sick. At the same time，the viruses keep developing inside the bats to create new variants (变体). These variants can then infect new hosts，such as other wild animals.

Pangolins (穿山甲)，for example，might be an intermediate host (中间宿主) for NCP，according to a recent study by Chinese scientists. This means that bats might have given the virus to pangolins，with pangolins then spreading it to humans.

Wild animals like snakes，hedgehogs (刺猬) and bamboo rats also carry various viruses. But since they live in the wild，there should be few chances for humans to come into contact with them and get infected—unless the animals are eaten or used to make animal products. When people hunt， buy and eat wild animals， they can introduce viruses to the rest of the population.

But this doesn’t mean that we should kill wild animals. Each species has a role in the eco-system (生态系统) and all of them are important in keeping a natural ecological balance. The lesson we can learn from disease outbreaks is to respect and protect animals and to live in harmony with them instead of hunting，killing，or eating them.

1.Why can bats host many viruses without getting sick?

A.Because these viruses are not deadly.

B.Because the viruses are kept in balance.

C.Because they have strong immune systems.

D.Because they can spread the viruses to other animals.

2.The underlined word“harmony”in the last paragraph probably means .

A.danger B.peace C.pain D.surprise

3.According to the story，what lesson should humans learn?

A.Research more about wild animals. B.Exercise regularly to stay healthy.

C.Stop keeping animals as pets. D.Don’t buy or eat wild animals.

练习册系列答案

相关题目

We learned English by doing things （划线部分提问）

________ ________ you learn English?

初中生活，精彩纷呈。回首过去你是否感到充实和快乐，展望未来你是否对高中生活充满期待，请结合以下提示谈谈你的感悟。

写作要点：

1、初中阶段你有哪些收获或进步；

2、初中阶段你有哪些遗憾；

3、你对未来的高中生活有哪些计划或打算。

写作要求：

1、内容必须包括所给要点，可适当发挥，增加细节，以使行文连贯；

2、语篇完整，语句通顺，语法正确，书写规范；

3、文章开头已给出，不计入总词数；

4、文中不能出现人名、校名或地名，否则不予评分。

The life of my junior high school is coming to an end._____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Mr. Wang is a doctor and ________ wife is a nurse in the same hospital.

A.he B.him C.his D.himself

加拿大的史密斯先生昨天收到李明的一封信。

Mr. Smith in Canada _______________ Li Ming yesterday.

A boy was growing in the orphanage(孤儿院). He often______the question to the or-phanage Dean(院长) sadly, “Such unwanted children like me, why on earth do they live in the world?”The Dean always smiled and______replied.

One day，the Dean brought a stone to the boy and said,“Sell the stone in______market tomorrow. No matter how much money people pay, you’ll never sell it.”The next day, the boy held the stone and squatted(蹲) in the corner of the market. To______surprise，many people found him and were interested in the stone in his hand. The price was higher and higher，but the boy didn’t sell it. When he was back to the orphanage, he reported that to the Dean______.The Dean smiled. Then the Dean asked the boy to take the stone to the gold mar-ket. In the gold market, someone gave ten times______price than it was yesterday. Still the boy didn’t sell it.

In the end，the Dean asked the boy______the stone to the diamond display market. As a result，the value of the stone went up over 10 times again. ______ the boy didn’t sell it. Soon it was spread as“a rare treasure”.The boy was so surprised and asked the Dean______. This time, the Dean didn’t smile. He said to the boy seriously,“The value of life is like this stone. In different situations it will have different______. As long as we value ourselves，the life is valuable. In fact,the value of life depends on your attitude.”

1.A.asked B.asks C.will ask D.has asked

2.A.often B.sometimes C.never D.usually

3.A.a B.an C./ D.the

4.A.he B.his C.him D.himself

5.A.excited B.excitedly C.tired D.tiredly

6.A.high B.higher C.lower D.lowest

7.A.taken B.takes C.taking D.to take

8.A.But B.And C.Or D.So

9.A.how B.when C.what D.why

10.A.meaning B.meanings C.accident D.accidents

— She looks upset. Do you know ________?

—Sorry. I don't know, either.

A.what's wrong with her B.how is she feeling

C.what the matter is D.what 's he thinking of

A 14-year-old Chinese boy Sun Yixiao was 1. his way home last Tuesday evening after school. When he was in the lift, it suddenly stopped. Feeling scared at first, the teenager decided to help 2. out. Sun tried to open the lift door, but he gave up the idea later and leaned against the wall, because he thought the 3. may fall down suddenly. He then pressed all the buttons in the hope of getting the lift work again, 4. it didn't work. Sun then pressed the "stop" button to lock the lift to 5. sure it would not fall. Without a cellphone at hand, Sun tried shouting 6. to get the attention of people outside, but no one answered as time went by. The young boy didn't give up 7. . He sent a note through the door with the message and hoped someone would 8. it up and help him out. After doing all these, the boy knew it might take a 9. time before someone found him. So he decided to do his homework. Soon after he finished his homework, he was saved at last.

On Weibo, many netizens (网民) spoke highly of the boy, because he could keep calm in the face of such 10. dangerous situation. We should learn from him.

—What do you want to be in the future, Nick?

—I want to be __________pilot of the J-15 fighter jet on the Liaoning. It is __________exciting job.

A.a；a B.a；an C.the；an D.a；the

试题分类