23．Why didn't the Class B kids perform well in the second exam?

　　A．Because they didn't work hard.

　　B．Because they had lost self­confidence.

　　C．Because their teachers were irresponsible.

　　D．Because what they learned was too difficult.

　　答案　B　[推理判断题。根据文章末句That was what they...what they became可知，B班的学生被认为比较差，最后他们失去了自信，也就真的差了。]

　　24．The experiment proved the importance of________.

　　A．great ambitions

　　B．natural talents

　　C．strong determination

　　D．outside influence

　　答案　D　[推理判断题。本文介绍了一个教学实验：成绩相同的两个班由于分别接受积极的和消极的外部影响，一年以后两个班的成绩出现明显差距。因此这项实验证明了外部影响的重要性。]

　　B

　　London has always been known for its “black fogs”．In the winter of 1952, a milky white fog rolled into the city.As the smoke poured into the air, it was so hard to see that people had to walk in front of the buses to guide them.In this way, the most serious air pollution disaster in history began.When it was over, more than 4,000 people had been killed by the thick black smog.

　　New York City has had several London­type smogs since 1950.Each time,100 to 400 deaths were caused by the smog.Although these smogs were not as deadly as London's, New York City has the worst air pollution problem in the United States.

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