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Since December,there have been tens of t...

    Since December,there have been tens of thousands of the COVID-19 cases both in and out of China,caused by a previously unknown virus:novel coronavirus.

What are they?Viruses are considered to be non-living organisms(有机物).They can't reproduce(繁殖) on their own. Instead, they invaded the cells of living organisms to reproduce, spread and take over.But the basic question is,where did viruses first come from? Until now, no clear explanation for their origin exists.

Understanding the origins of viruses means fully understanding the history of their hosts not only humans,but also bacteria,plants and other animals,which is a complicated task. However,there are three main theories to explain the origin of viruses.First,viruses started as independent organisms,then became parasites(寄生者). Second,viruses evolved(进化) from pieces of DNA or RNA that"escaped"from larger organisms.The third one is that viruses co-evolved with their host cells,which means they existed alongside these cells.

For the time being,these are only theories.The technology and proofs we have today cannot be used to test these theories and discover the most plausible explanation.Continuing studies may provide us with clearer answers.Or future studies may find that the answer is even more mysterious than it now appears.

1.What can we learn about viruses from the article?

A.They mainly infect animals and plants.

B.They are really small living organisms.

C.They are more dangerous than bacteria.

D.They can't reproduce unless they find a host cell.

2.Which of the following might explain the origin of viruses?

A.They evolved along with their host cells.

B.They evolved from the DNA or RNA in animals.

C.They evolved from the fossils of large organisms.

D.They evolved from parasites to independent organisms.

3.The underlined word"plausible"in the last paragraph probably means______.

A.creative B.reasonable

C.common D.unbelievable

4.What can we conclude from the article?

A.The author is confident about future virus research.

B.Viruses will become more like bacteria as they evolve.

C.Viruses live longer in human host cells than in animals.

D.It may take a long time to understand the origin of viruses.

 

1.D 2.A 3.B 4.D 【解析】 本文为说明文。自去年12月以来,国内外出现了无数新冠肺炎病例,到目前为止,对于它的起源还没有明确的解释,还有待研究和发现。 1. 细节理解题。根据第二段They can't reproduce(繁殖) on their own. Instead, they invaded the cells of living organisms to reproduce, spread and take over(它们不能自己繁殖。相反,它们侵入生物体的细胞进行繁殖、扩散和接管)可知,除非它们找到寄主细胞,否则它们无法繁殖,故选D。 2. 细节理解题。根据倒数第二段The third one is that viruses co-evolved with their host cells,which means they existed alongside these cells(第三种说法是病毒与宿主细胞共同进化,也就是说病毒与宿主细胞共存)可知,它们和宿主细胞一起进化,故选A。 3. 词义猜测题。根据最后一段第一句For the time being,these are only theories. The technology and proofs we have today cannot be used to test these theories …可知,目前,这些还只是理论。我们今天拥有的技术和证据不能用来检验这些理论,因此也不能发现最合理的解释。可推知,plausible 意为“合理的”,与选项B. resonable意义一致,故选B。 4. 推理判断题。根据最后一段Continuing studies may provide us with clearer answers.Or future studies may find that the answer is even more mysterious than it now appears.(继续学习可能会给我们提供更清楚的答案。或者,未来的研究可能会发现,答案比现在看起来更加神秘。)可知,目前这些还只是理论,目前还无法验证和给出最合理解释,因此了解病毒的起源可能需要很长时间,故选D。
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    One summer night, the whole family of Irene was asleep with the windows open. It was very quiet when there was a loud noise from the stable(马厩).Irene woke up from her sweet dream,and the noise continued.Then she heard a horse running fast towards the house.The next thing she saw was her horse,Thunder,standing outside of her window,neighing(嘶叫) and shaking his head.She knew something was wrong.Irene quickly got everyone out of the house before the earthquake hit.Thunder saved her life.

As amazing as this story is,it is not as uncommon as you may hear of the story of Doris and her cat Maggie.One night,Doris was in a deep sleep when she was woken by her cat Maggie.Maggie was meowing wildly outside Doris's bedroom and throwing herself against the closed bedroom door.When Doris opened her eyes,she saw her bedroom full of smoke.As she escaped her house,she saw a fire was burning in her kitchen.Even though Maggie could have escaped the house through a cat door,she wouldn't leave Doris.

There are also stories of wild animals coming to the rescue of humans.Once,Lyndon was surfing with his friend when he was attacked by a four-meter shark.During the attack,a group of dolphins came to his rescue by forming protective ring around Lyndon until be could get safely to shore.Without the help of the dolphins,there is little chance that Lyndon could have escaped.

No one is sure why animals have so often come to our rescue.However,it is clear that most of us haven't realized their kindness.It is important that we care for them as much as we can.

1.What was Irene doing before the earthquake hit?

A.She was sleeping soundly.

B.She was opening the windows.

C.She was visiting her neighbors.

D.She was getting her horse out of the stable.

2.Why did Maggie throw herself against the door?

A.She was afraid of smoke.

B.She wanted to get out of the room.

C.She was trying to wake up her owner.

D.She felt bored and was playing by herself.

3.What do we know about Maggie and Thunder?

A.They were shy and quiet.

B.They were brave and devoted.

C.They often made noise at night.

D.They saved their owners some times.

4.What can we know from the article?

A.It is clear why animals often save humans.

B.Humans haven't realized animals' s kindness

C.Humans have a good relationship with animals.

D.Animals can often come to the rescue of humans.

 

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A Guide to the University

Food

The TWU Cafeteria is open 7a.m.to 8p.m..It serves snacks,drinks,ice cream bars and meals.You can pay with cash or your ID cards.You can add meal money to your ID cards at the Front Desk.Even if you do not buy your food in the cafeteria,you can use the tables to eat your lunch,to have meetings and to study.

If you are on campus in the evening or late at night,you can buy snacks,fast food,and drinks in the Lower Cafe located in the bottom level of the Douglas Centre.This area is often used for entertainment such s concerts,games or TV watching.

Relaxation

The Globe,located in the bottom level of McMillan Hall,is available for relaxing,studying, cooking,and eating.Monthly activities are held here for all international students.Hours are 10 a.m.to 10 p.m.,closed on Sundays.

Health

Located on the top floor of Douglas Hall,the Wellness Centre is committed to(致力于)physical,emotional and social health.A doctor and nurse is available if you have health questions or need immediate medical help or personal advice.The cost of this is included in your medical insurance.Hours are Monday to Friday,9:00 a.m.to noon and 1:00 to 4:50 p.m..

Academic Support

All students have access to the Writing Centre on the upper floor of Douglas Hall.Here, qualified volunteers will work with you on written work,grammar,vocabulary,and other academic skills.This service is free.

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A.Do homework and watch TV.

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D.Add money to your ID and play chess.

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A.The Globe,Friday.

B.The Lower Cafe,Sunday.

C.The TWU Cafeteria,Friday.

D.The McMillan Hall,Sunday.

3.The Guide tells us that the Wellness Centre______.

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C.trains students in medical care

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Coronaviruses(冠状病毒)are a large family of viruses that cause disease in mammals and birds. Coronaviruses can cause illnesses that range 1. the common cold to many more severe illnesses.

The 2. (new)identified viruscalled COVID-19is thought to have spread to humans from wild animals sold at a market in Wuhanin 3.(centre)China’s Hubei Province. But it is now spreading between people. Chinese officials say 4. disease is able to spread from one person to another even before any actual signs appear5. makes it especially hard to contain.

Signs of some patients 6. (affect)by the disease have included fevercoughshortness of breath and general breathing difficulities. In some more severe 7. (case)the virus can cause pneumonia(肺炎). Some people report few or no signswhile others have gotten very sick or even died. There is no special 8.(treat)for the new coronavirus at present. Howevermany of its effects are treatableas long as a patient is in fair health.

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