下列哪种不是疫苗（） A.亚单位疫苗 B.基因工程疫苗 C.合成肽疫苗 D.人免疫球

下列物质中，属于氧化物的是（　　）

A．H₂O

B．KClO₃

C．NaCl

D．H₂SO₄

下列关于鸦片战争的说法，不正确的是（   ）

A．获取商品市场是列强发动战争的根本原因

B．鸦片问题是引发战争的借口

C．英国是侵华急先锋，美国是积极的追随者

D．列强侵华的根本目的是割占中国领土

某工地钻孔灌注桩基础采用反射法检测桩身完整性时，平均波速为4000m/s，反射波首先返回的时间为0.005s，则缺陷位于桩顶下( )。

A．10m

B．20m

C．40m

D．80m

阅读理解

    A person may have an idea about himself that will prevent him from doing good work. He may have

the idea that he is not capable (能胜任的) of it. A child may think he is stupid because he does not

understand how to make the most of his mental faculties(机能), or he may accept another person's

mistaken estimate(评价) of his ability. Older people may be handicapped(阻碍) by the mistaken belief

that they are incapable of learning anything new because of their age.

    A person who believes that he is incapable will not make a real effort, because he feels that it would

be useless. He won't go at a job with the confidence necessary for success. He is therefore likely to fail,

and the failure will strengthen his belief in his incompetence. Alfred Adler, a famous doctor, had an

experience which shows this. When he was a small boy he got off to a poor start in arithmetic. His teacher got the idea that he had no ability in arithmetic, and told his parents what she thought in order that they

would not expect too much of him. In this way, they too developed the idea, "Isn't it too bad that Alfred

can't do arithmetic?" He accepted their mistaken estimate of his ability, felt that it was useless to try,and

was very poor at arithmetic, just as they expected.

   One day Adler succeeded in solving a problem which none of the other students had been able to

solve. This gave him confidence. He rejected (refused) the idea that he couldn't do arithmetic and was

determined to show them that he could. His newfound confidence encouraged him to go at arithmetic

problems with a new spirit. He now worked with interest, determination and purpose, and he soon

became extraordinary good at arithmetic.

     This experience made him realize that many people have more ability than they think they have, and

that lack of success is as often the result of lack of knowledge of how to apply one's ability, lack of

confidence, and lack of determination as it is the result of lack of ability.

1. Why might a person be prevented from doing good work? ________.

A. Because he thinks he is old enough to make the most of his mental facilities

B. Because he accepts another person's mistaken estimate of his ability

C. Because he has the idea that he is incapable of doing everything

D. Because he believes in what other people think of him

2. A person who believes in his low ability will ________.

A. spare no efforts to do things      

B. fail to go at a job but never lose heart

C. change to learn other course instead of mathematics

D. show complete lack of confidence

3. As a boy, Alfred Adler was poor at arithmetic because ________.

A. he lost his self-confidence              

B. he was weak in thinking

C. his parents expected too much of him   

D. his teacher had no confidence in herself

4. Which of the following is the most important factor to Alder's success?________

A. Spirit and experience                

B. Interest and self-respect

C. Confidence and determination          

D. Purpose and knowledge

5. Alder's experience made him realize that ________.

A. people are not as capable as they think 

B. people can be more capable than they think

C. lack of confidence leads to failure      

D. lack of ability results in lack of determination

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