问题 阅读理解

阅读理解。

    The Beets were a new couple (夫妇). The things in their rooms, such as the television, the computer,

the fridge, furniture and so on, were all left by their parents. They only paid some money for their food

and clothes. But they tried their best to save money. If they had something important to tell their friends,

they always visited them instead of calling them.

    One day, it was a quarter past nine. Mr Beet didn't come back. His wife was a little worried. The supper

was cold and she had waited for two hours and a half. She was sitting by the table in the dark room.

     Suddenly the woman heard someone coming upstairs. It was her husband's step. She hurried to open

the door. In the dark she could hear his deep breathing. As soon as he sat down, she turned on the light and

found he looked very tired.

    "Why do you come back so late, dear?" asked the woman. "Haven't you caught a bus?"

     "Yes, but I didn't take it."

     "Why not?"

     "I ran after it so that I saved two dollars this evening."

     "That's great!" the woman said happily. "Run after a taxi next time and you'll save both more time and

money."

1. The supper was ready at           . [ ]

A. 6:15

B. 6:30

C. 6:45

D. 7:15

2. Mrs Beet sat in the dark because           . [ ]

A. she wanted to save money

B. she didn't like the bright light

C. she was afraid to be seen

D. she wanted to have a good rest

3. Mr Beet went back           . [ ]

A. by taxi

B. by bus

C. on foot

D. by bike

4. When Mr Beet got home that evening,            . [ ]

A. his wife was angry with him

B. he was very tired

C. he was too hungry to say a word

D. his wife felt sorry

5. Mrs Beet hoped           . [ ]

A. her husband went home by bus the next time

B. her husband could keep on doing exercise

C. her husband could be stronger and stronger

D. her husband could save more money and time

答案

1. C  2. A  3. C  4. B  5. D

阅读理解与欣赏

疫苗的帮手

       甲型H1N1流感的防控工作再次证明疫苗是人类抵抗病毒感染的有效武器。但是疫苗不能直接杀死病毒,它只是个模仿病菌入侵的“骗子”,诱骗人体自身的免疫大军投入战斗。如果某人的免疫系统不够健全,疫苗对他就没用。解决这个问题的办法之一就是在疫苗中加入佐剂。

       佐剂是如何帮助疫苗的呢?免疫系统中,专门负责通风报信的是树突细胞,它们就好像是侦察兵,一遇到可疑之人就立即将其抓住,并根据其特点决定是否拉警报。侦察兵往往不容易被骗。佐剂的作用就是帮助疫苗欺骗侦察兵,把疫苗弄得花花绿绿,故意让侦察兵看见。

       佐剂如果用得好,可以大大提高疫苗的效率。比如一种流感疫苗加入佐剂后,可以把65岁以上老年人群的接种有效率提高到90.5%。另一种H5N1禽流感疫苗加入佐剂后,只需要用1/3的疫苗用量就可以达到同样的治疗效果。后一种效果的重要性是不言而喻的,每次大规模流感爆发时,最让政府卫生部门头疼的就是疫苗生产能力不足。

       新的研究表明,树突细胞不但能够发出警告,甚至还能识别不同的敌人,告诉指挥官应该做出什么样的反应,派遣相应的免疫细胞前去杀敌。据此,科学家正在利用佐剂来模仿不同的敌人,诱使免疫系统做出特定的反应来治疗疾病。比如,科学家用疫苗来对付肺癌时,就加入了一种从细菌中提取的佐剂。这种佐剂能够模仿细菌入侵,刺激树突细胞发出警报,促使指挥官派出能够抑制癌细胞的免疫细胞应战。临床试验表明,有大约l/3的肺癌病人病情得到了控制。

1.阅读理解选文,指出下面两则材料分别说明了佐剂的什么作用?

【材料一】 据统计,在接受未加入佐剂疫苗注射的65岁以上的老年人当中,只有一半人产生了足够多的抗体,也就是说,有一半老年人疫苗白打了。

【材料二】 一位纽约医生发现有些发高烧的病人体内肿瘤会自动消失。他据此研制出一种“科里毒素”用于治疗癌症,居然有一定疗效。科里毒素其实就是从细菌中提取的一种免疫佐剂,能够诱发人体免疫系统做出相应反应,顺便杀死了癌细胞。

(1)材料一说明:                                                                                                             

(2)材料二说明:                                                                                                                        

2.本文的说明语言生动形象,请举一例加以分析。

     答:                                                                                                                                                  

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