问题 选择题

人体能及时消除体内衰老、死亡和损伤的细胞,这属于(  )

A.防御感染

B.自身稳定

C.免疫监视

D.以上三者都是

答案

免疫最初的含义是指人体对病原体及其有害产物的抵抗力;现状人们对免疫的看法是:免疫是指人体的一种生理功能,人体依靠这种功能识别“自己”和“非己”成分,从而破坏和排斥进入体内的抗原物质,或人体本身产生的损伤细胞和肿瘤细胞等,以维持人体内部环境的平衡和稳定.人体的免疫功能指的是:防御感染、自我稳定、免疫监视.防御感染是指抵抗抗原的侵入、防止疾病发生、维护人体健康.该功能过强会出现过敏反应.自我稳定指:清除体内衰老的、死亡的或损伤的细胞,该功能过程会出现类风湿疾病.免疫监视指:识别和清除体内产生的异常细胞和肿瘤细胞,维持人体内部环境的平衡和稳定,该功能异常易得肿瘤.

故选B

解答题
阅读理解

As an English teacher, I’ve been lucky enough to travel to many countries all over the world. I’ve seen people celebrate everything from the arrival of new babies to the delivery of new cars. I’ve attended weddings, parties and religious celebrations in countries such as Argentina and Japan, and I’ve noticed that gold---the metal or the colour of it---is always part of cultural events, traditions and celebrations.

It makes me wonder: Why do people love gold?

For some people, gold seems to be a status(地位)symbol. Indian businessman Datta Phuge loves gold so much that he even bought a shirt made of gold at a cost of $250,000. I’m not sure I’d spend so much money on a shirt, would you? But Datta Phuge has his reason .He explains,“ Some people want to own an Audi or a Mercedes. I choose gold.”

For other people, gold is an investment(投资). The price of gold generally increases over time and in European markets, it reached even $1,500 per ounce in 2011.

And for many people, a family heirloom(传 * * )brings together status and investment. My mother has a gold bracelet(手镯)that was given to her by her grandmother who, in turn, inherited it from her own grandmother. It’s quite a heavy piece and probably worth quite a lot of money. But its mental value is greater than its value in dollars. It’s a beautiful object that holds many family memories. When the time comes, my mum will give the bracelet to me, and one day, I’ll pass it on to the younger generation.

Therefore, status and investment are good reasons to value gold. However, I think that the real reason why people love gold is that it can be made into beautiful objects. Think about Tutankhamen’s death mask. Have you ever seen anything so beautiful?

People love gold because it holds their minds, their imaginations and, above all, their hearts.

小题1:The main idea of the first paragraph is that______.

A.the author has traveled to many countries

B.people celebrate almost everything

C.there are many ways to use gold

D.people all over the world love gold小题2:Datta Phuge bought a shirt made of gold because________.

A.gold is a status symbol to him

B.he loves this kind of shirt

C.people there love gold so much

D.he is a successful businessman小题3:According to the passage, in Europe,gold could be________per ounce in 2010.

A.$1,550

B.$1,500

C.$1,450

D.$1,600小题4:The gold bracelet is the heirloom for the author’s family mainly because______.

A.it’s worth a lot of money

B.it brings status and investment

C.it’s a beautiful object

D.it holds family memories小题5:In the author’s opinion, the real reason why people love gold is that________.

A.it is a status symbol to some people

B.it can be made into beautiful objects

C.it can be passed on to the younger generation

D.it can bring people a lot of money