Question

【题目】 As the novel corona-virus (新型冠状病毒) spreads throughout China and the rest of the world, an important question has yet to be answered: where did the virus come from?

The latest study showed that pangolins (穿山甲) may be an intermediate (中间的) host of virus, according to Xinhua. However, bats are suspected to be the original cause.

"We don't know the source yet, but there's pretty strong evidence that this is a bat origin corona-virus," said Peter Dazsak, president of Eco-Health Alliance, an environmental nonprofit (非营利机构), according to The New York Times. "When you look at the genetic sequence (基因序列) of the virus, and you match it up with every known corona-virus, the closest ones are from bats," Dazsak also told CNN.

So why are bats the source of so many deadly kinds of viruses and why don't they suffer from any symptoms (症状)? Bats are mammals (哺乳动物) that have a long lifespan (寿命) and live with millions of other bats in caves, where they can potentially spread the virus far and wide. As the only lying mammal, their body temperature is high, similar to a fever It's this fact that may contribute to bats' unique immune system (免疫系统) in protecting from the ill effects of viruses.

But are bats truly to blame for the virus or should we be blaming ourselves? It's the fault (错误) of humans for decreasing (减少) the distance between us and virus-carrying bats. Bats are an important animal in our ecosystem (生态系统) when it comes to pollinating (授粉) many fruits such as mangoes, bananas and avocados. We need to allow them to continue pollination and keep them away from our markets and mouths.

【1】What can we learn about the origin of COVID-19?

A.Bats have been discovered to be its original cause.

B.Pangolins are now considered the most likely source.

C.It's confirmed by comparing sources of several different viruses.

D.The virus was found to be genetically similar to those see in bats.

【2】Why don't bats suffer from the corona-virus?

A.Their low body temperature protects them.

B.Bats have a unique immune system.

C.Bats are the only flying mammal to live in groups.

D.Living in caves helps bats fight against viruses.

【3】What is the main point the author makes in the last paragraph?

A.Virus-carrying bats should be killed.

B.Humans should stay away from bats.

C.Bats benefit but also harm our ecosystem.

D.Bats could spread Viruses during pollination.

Answer 1

【答案】

【1】D

【2】B

【3】B

【解析】

本文介绍了随着新型冠状病毒在中国和世界的传播，病毒来源是哪里尚未清楚。最新研究表明穿山甲是病毒的中间寄主，而蝙蝠也被怀疑是病毒的直接来源。人们毁坏并接触了蝙蝠的生活区域，使自身处在患病风险之中。蝙蝠是生态系统的重要组成部分，人类不该打破生态平衡。

【1】细节理解题。题干意思为：关于新冠病毒我们了解多少。根据“We don't know the source yet,”我们还不知道病毒的来源。可知，A选项错误。根据“The latest study showed that pangolins (穿山甲) may be an intermediate (中间的) host of virus,”最新研究表明，穿山甲可能是病毒的中间宿主。而不是病毒的来源，因此B错误。根据“When you look at the genetic sequence (基因序列) of the virus, and you match it up with every known corona-virus, the closest ones are from bats,”当你观察病毒的基因序列，并将其与所有已知的冠状病毒相匹配时，最接近的病毒来自蝙蝠。可知，C选项说通过比对众多病毒确认了新冠病毒的来源，是错误的，只是相似而不是确定。而选项D说该病毒被发现与蝙蝠携带的病毒相似。因此D正确。

【2】细节理解题。题干意思是：为什么蝙蝠不会感染新冠病毒。根据“their body temperature is high, similar to a fever,”它们的体温很高，与发烧相似。A选项说蝙蝠的身体低温保护了它们，错误。根据“It's this fact that may contribute to bats' unique immune system (免疫系统) in protecting from the ill effects of viruses.”可知，蝙蝠独特的免疫系统能免受病毒的有害影响。因此B正确。根据“As the only lying mammal,”作为唯一躺着的哺乳动物。C选项说蝙蝠是唯一的群居的飞行哺乳动物，是错误的。根据“live with millions of other bats in caves,”与数百万只蝙蝠生活在洞穴中。可知，D选项说蝙蝠居住在洞穴，这帮助了它们对抗病毒，文中并未提到，错误。故B符合题意。

【3】细节理解题。题干意思为：作者在最后一段中提出的观点是什么？根据“We need to allow them to continue pollination”我们应该允许他们继续授粉。可知，蝙蝠的授粉对生态系统是有益的，不应该杀害，A、C选项错误；根据“Bats are important animal in our ecosystem（生态系统）when it comes to pollinating（授粉）many fruits,”当谈及授粉时候，蝙蝠在我们的生态系统中是非常重要的。可知，D为过度推测（蝙蝠能通过授粉传播病毒），排除。根据“keep them away from our markets and mouths.”他们远离我们的市场和餐桌。可知，我们应该远离蝙蝠，综合可知B选项正确。