Question

【題目】 Are you sniffling, sneezing or coughing? If so, you might have a virus(病毒). Viruses can make you sick. Colds are caused by viruses. Scientists have a question about viruses. They want to know: Is a virus a living thing? Not all scientists agree on the answer.

Some illnesses are caused by bacteria (細(xì)菌). Scientists think bacteria are alive. They are very, very small. Still, they do many things that living things do. They take in nutrients(營養(yǎng)), just as people do by eating. Then they make more bacteria. After a while, they die. Viruses are different. To make more viruses, they take over the cells of other creatures( 生 物 ) because viruses need proteins(蛋白質(zhì)) to survive(存活) but they cannot make proteins on their own. So they have to spread disease to people and other animals, then the virus can make proteins, which lets it make more of itself. That is one reason why some scientists say viruses are not alive. Living things can make their own proteins. Viruses cannot.

Other scientists disagree. They say viruses are alive. These scientists argue that many living things need a host. Parasites(寄生蟲) are one example. They are living things. Yet they can only survive in a host. An example of a host would be a human or a dog. Viruses are not so different.

It does not really matter if viruses are alive or not. That is just a undecided question that scientists have for fun. However, there are plenty of good reasons to study viruses. Scientists want to learn more about how they work.

【1】You could have a virus if you________.

A.feel sleepyB.have some parasitesC.have a cold

【2】How do viruses make proteins?

A.By taking in nutrients.

B.By making proteins by themselves.

C.By bringing disease to people and other animals

【3】The underlined word take over means________.

A.接受B.借用C.生產(chǎn)

【4】Why do some scientists think viruses are alive?

A.Because viruses also need to depend on other creatures to live.

B.Because viruses have to use proteins to make more viruses.

C.Because viruses don’t need a host at all.

【5】Which of the following is NOT true?

A.Not only viruses but also bacteria can make people fall ill.

B.For scientists, it is still unknown whether viruses are alive or not now.

C.After spreading disease to people, the number of viruses will become smaller.

Answer 1

【答案】

【1】C

【2】C

【3】B

【4】A

【5】C

【解析】

文章介紹了關(guān)于病毒的一些情況。病毒是不是生物，科學(xué)家意見不一致，病毒自己不能制造蛋白質(zhì)，它需要借助其他生物的細(xì)胞來制造蛋白質(zhì)，所以它就把疾病傳給動物和人，這就是一些科學(xué)家說它不是生物的原因；另一些科學(xué)家認(rèn)為病毒是生物，它只是需要一個寄主，這個寄主就是人和動物。不管怎么說，科學(xué)家想做的就是了解更多病毒是怎樣工作到。

【1】細(xì)節(jié)理解題。根據(jù)Colds are caused by viruses.感冒是病毒引起的，故選C。

【2】細(xì)節(jié)理解題。根據(jù)So they have to spread disease to people and other animals, then the virus can make proteins它們傳播疾病給人或動物，然后病毒制造蛋白質(zhì)；故選C。

【3】詞義猜測題。根據(jù)viruses need proteins(蛋白質(zhì)) to survive(存活) but they cannot make proteins on their own病毒需要蛋白質(zhì)生存，但是它們不會制造蛋白質(zhì)，可推測是“借用”其他生物的細(xì)胞；故選B。

【4】細(xì)節(jié)理解題。根據(jù)They are living things. Yet they can only survive in a host.它們是生物，它們僅僅能生存在一個寄主上；故選A。

【5】推理判斷題。根據(jù)Viruses can make you sick.病毒能讓你生病，Some illnesses are caused by bacteria (細(xì)菌)細(xì)菌也引起一些疾病，可知A對；根據(jù)It does not really matter if viruses are alive or not. That is just a undecided question that scientists have for fun.病毒是否是活的，不是一個真正的問題，它只是一個科學(xué)家為了樂趣沒有決定的問題，可知B對；根據(jù)So they have to spread disease to people and other animals, then the virus can make proteins, which lets it make more of itself.把疾病傳給人后，病毒能制造更多的病毒，可知C不對；故選C。