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问题 选择题

小丽同学的笔记本上有如下总结，你认为其中正确的是 [ ]

A．发生化学变化时一定有发光放热等现象

B．有发光放热现象产生的变化一定是发生化学变化

C．没有观察到任何明显的变化，则不能发生化学变化

D．发生化学变化时可能有发光放热等现象，也可能没有明显的现象

答案

答案：D

选择题

—All the students in Class One went to the cinema ________ Li Ping. Why?

—Because he had a stomachache. [ ]

A. besides

B. without

C. except

D. beside

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单项选择题

(三) Researchers have shown that noise can adversely affect human in both physiological and psychological ways. Hearing losses in particular occupations such as ship - building and con- structi - on work are well - known. In fact, however, we all find hearing more difficult as we age. Young ears can distinguish a wide range of sounds from low to very high frequencies, while older ears lose the ability to distinguish high -pitched sounds. A comparison of people living in some industrialized and non - industrialized areas suggests that this hearing loss may not necessarily accompany old age. Furthermore, a closer inspection of other data reveals economic effects. For instance, an increased turnover in property has been observed in noisy areas near airports. Job performance can be adversely affected by loud noise, especially if accuracy and mental effort are involved. The use of outdoor areas for conversation is not possible for an estimated 5 to 10 million people who live or work in urban areas. When interference with television or speech or sleep is included, as many as 22 to 24 million people can be said to have lost part of the use of their homes and grounds because of noise. Thus noise pollution is a serious environmental concern. The indifferent attitude toward noise should be overcome; considerable efforts should be made to alert people to the grave effects that may stem from an excessively noisy environment.

Which is NOT true according to the passage ______

A．Different occupations have different effects on people’s hearing ability.

B．People working in noisy environment are more likely to develop hearing problem.

C．Noise can affect people’s daily lives.

D．Urban people live in smaller homes because of noise.
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