题目内容

【题目】艾滋病是HIV感染所引起的人类免疫缺陷疾病。下列有关艾滋病的叙述,正确的是

A.HIV主要通过感染人体B淋巴细胞,从而影响体液免疫

B.艾滋病人群患恶性肿瘤的比率与健康人相比没有差异

C.HIV在繁殖过程中,利用其RNA和宿主的翻译系统合成病毒自身的蛋白质

D.正常人与艾滋病患者一起就餐会感染艾滋病

【答案】C

【解析】A、HIV主要感染人体T淋巴细胞,导致机体对其他病原微生物入侵的抵抗力下降,A错误;B、由于艾滋病人的免疫功能降低,免疫系统的监控和清除功能下降,艾滋病人群患恶性肿瘤的比率与健康人相比较高,B错误;C、HIV在繁殖过程中,其RNA在宿主细胞中,利用宿主细胞的原料,控制病毒自身蛋白质的合成,C正确;D、正常人与艾滋病患者一起就餐不会感染艾滋病,D错误。

练习册系列答案
相关题目

【题目】七选五

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

In spite of so many years of education behind us, can we confidently say we understand what it feels like to be a teacher?

The biggest misunderstanding about teaching jobs is that anyone can be a teacher. In fact, the truth is far from it. 1 They also know the teaching theory well. They should know how things should be taught and how one can be inspired to learn. Also, they need to have an idea about classroom management and students’ psychology(心理学).

Now it can be really annoying for a teacher if someone says teaching is one of the easiest jobs around, because everyone just needs to be taught for a few hours a day. 2 However, teachers work longer to come up with ways to make the knowledge appear more interesting to students and help them learn better.

3 And this is a big reason why more people decide to choose teaching as a career. However, good teachers choose to make good use of the break, by enrolling (注册) themselves for workshops on teaching, classroom management, and related things.

All teachers are not the same, as against what is widely believed. 4 Every teacher is different and has a different approach(方法)to teaching.

5 A teacher has meetings to attend, and is responsible for (对……负责) organizing school events. An important duty of a teacher is to prepare the progress report of each student and discuss it with his or her parents.

In a word, teachersspan> ought to be respected for what they do, and we should never forget their great contribution(贡献)to our success in life.

A. A teacher has many things to do rather than just teach.

B. It is true that teachers get a lot more holidays than others.

C. A good teacher is one who motivates students to overcome challenges.

D. To begin with, teachers are people who perform well in their fields of study.

E. A statement that is true for one teacher is not necessarily true for the others.

F. And common people even believe teachers are probably overpaid when their days end at 3 pm.

G. These teachers give all they can to create an ideal learning environment for their students.

【题目】B

It was 1504, Columbus was making another trip to the New World. Columbus and his men needed fresh water and food after three months at sea. They saw an island and went on to the shore. On the island, there were unfriendly Indians who refused to give food to them. Columbus’ men were afraid of the Indians, but he had a clever plan. He used sign language to tell the Indians about his mysterious (神秘的) power to turn off the light in the sky. He knew about a lunar eclipse (月蚀) the next night because the information was in his almanac (历书). Columbus told the Indians, "Tomorrow night I’ll turn off the light in the sky." But they didn’t believe him. When the eclipse began the next night the Indians became very frightened. They begged Columbus to turn on the light again, and they quickly gave him all the food and water he wanted. Immediately Columbus and his men hurried back to the ship and sailed away in the moonless night.

【1】 Columbus and his men stopped at the island because __________.

A. they wanted to meet the Indians there

B. they hoped to get supplies of food and water

C. they had never been on the island before

D. they had planned to visit it

【2】 The Indians __________ Columbus and his men.

A. were glad to see B. were kind to

C. welcomed D. were not kind to

【3】Columbus __________ to tell the Indians that he had mysterious power.

A. used movements of /span>hands and expressions in his face

B. spoke in the language of the Indians

C. drew a lot of signs

D. wrote in the language of the Indians

【4】"The light in the sky" here means __________.

A. the sun B. the moon C. the stars D. the daylight

【5】The Indians gave Columbus food and water because they __________.

A. believed Columbus was a man with mysterious power

B. were interested in Columbus’ trip

C. wanted to help Columbus

D. were clever

【题目】七选五型阅读理解

The Iron Lady

Margaret Thatcher, known as the Iron Lady, was one of the toughest political women in the world.

As the daughter of a businessman and mayor of Grantham, Margaret was educated at a very famous grammar school. 1 Upon graduation, she worked for four years as a research chemist. She then became a lawyer, doing an excellent job in taxation law, in 1954. Miss Margaret stood twice in elections for the Conservative Party before being elected to the House of Commons(下议院) in 1959. 2 After that she quickly became a spokesman for her party, and member of the Shadow Cabinet(影子内阁).

3 Thatcher spent quite a lot of time visiting schools and universities, who encouraged people to be creative. After the Conservatives lost power in 1974, she was appointed to the Shadow Cabinet. She was elected leader of the Conservative Party in the following year. In May 1979, she became Britain’s first female prime minister, after the Conservatives regained power from Labor.

4 She fought against labor organizations. According to a figure reported by her government, traditional industries were reduced to around 15,000 in total and she also made social housing and public transport private.

She left office on November 28, 1990 after she failed to carry out a fixed rate local tax, which led to huge popular protest from within her party. In 1992, she was appointed to the House of Lords(上议院), as Baroness Thatcher of Kesteven. In the last few years of her life, she has been busy with writing and public speech. This caused her increasingly poor health. 5

A. She got a degree in chemistry at Oxford University.

B. Also she built strong association with US President Raegan.

C. In June 1970, she became secretary of state for education and science.

D. In power, she was best known for her reducing Britain’s traditional industries.

E. Therefore, she had to give up many chances of attending public activities.

F. Thatcher was appointed as a Minister in 1961.

G. Thatcher was well-known.as a female leader.

【题目】阅读下面短文并回答问题,注意词数要求。

[1] Ashley Powers mother bought a computer for her when she was eight. When she was thirteen, she was surfing the Internet regularly, but she couldnt find anywhere for teenagers to meet and talk. And one day she thought, If I had my own website, Id make it a really interesting site for teenagers.

[2]So, when Ashley was sixteen, she launched her own website, called Goosehead. She had no idea how big a success it would be, but three years later, the site was the most successful teen site in the USA! It was getting 100,000 hits every day, and Ashley had about 30 employees.

[3] After a few years, the website closed down. Then Ashley, who lives in Los Angeles, was asked to write a book called The Goosehead Guide to Life. The book is about how to design a website and start a business. It begins with a section called All About Ashley, where Ashley tells readers what it is like to be the boss of a company when you are only sixteen. I was so happy. But it was crazy in a lot of ways. I got very stressed. I mean, I was only sixteen I didnt even have a car! If you were sixteen and you had your own company, youd be stressed, too!

[4] In an interview Ashley gave advice to teenagers who wanted to start their own business, Just be strong and have your dreams and work hard at them. And dont listen when _______, because I heard no a lot. Just keep going until you hear yes!

【1】 For what purpose did Ashley create GooseHead?(no more than 10 words)

__________________________________________________________________

【2】 What is the main idea of Paragraph 2? (no more than 6 words)

__________________________________________________________________

【3】 According to paragraph 3, what did Ashley do after GooseHead closed down?(no more than 10 words)

__________________________________________________________________

【4】 How did Ashley feel as a young boss of a company?(no more than 5 words)

__________________________________________________________________

【5】 Fill in the blank in Paragraph 4 with proper words.

__________________________________________________________________

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网