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问题 填空题

一种洗衣机连续两次降价10%后，每台售价1660.5元，这种洗衣机每台原价是______元．

答案

1660.5÷（1-10%）÷（1-10%），

=1660.5÷0.9÷0.9，

=1845÷0.9，

=2050（元）；

答：这种洗衣机每台原价是2050元．

故答案为：2050．

单项选择题

我国银行间债券回购市场快速发展的根本原因在于______

A．市场本身的高安全性满足了各类经济主体对资产组合的管理要求
B．中国人民银行放松管制
C．允许更多类型的交易主体进入市场参与交易活动
D．允许银行间拆借
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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.

We can learn from this passage that______

A．young people are sensitive to high -pitched sounds

B．young people distinguish low frequency noise better than old people

C．high frequency noise can cause hearing loss in old people

D．people in industrialized areas will suffer hearing loss when they are old
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