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【多选题】
关于电脑清洁除尘保养的方法,下列说法正确的有?A.
应定期打开机箱，用干净的软布、不易脱毛的小毛刷、吹气球等工具进行机箱内的部除尘。
B.
对于机器表面的灰尘，可用潮湿的软布和中性高浓度的洗液进行擦拭，擦完后用清水清洗。
C.
键盘在使用时，会有灰尘落在键帽下影响接触的灵敏度，使用一段时间后，可以将键盘翻转过来，适度用力拍打，将嵌在键帽下面的灰尘抖出来。
D.
CPU风扇和电源风扇由于长时间的高速旋转，轴承受到磨损后散热性能降低并且还会发出很大的噪声，一般一年左右就要进行更换。
E.
计算机在工作的时候，会产生一定的静电场、磁场，加上电源和CPU风扇运转产生的吸力，会将悬浮在空气中的灰尘颗粒吸进机箱并滞留在板卡上。如果不定期清理，灰尘将越积越多，严重时，甚至会使电路板的绝缘性能下降，引来短路、接触不良，霉变，造成硬件故障。
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【单选题】The cost is too big for playing basketball: a pair of shoes can't be weared, and a pair of trousers______broken.
A.
have
B.
have been
C.
has
D.
has been
【单选题】If the price of a dress is three times the price of a pair of shoes, then a pair of shoes contributes
A.
a. exactly one-third as much to GDP as does a dress.
B.
b. more than one-third as much to GDP as does a dress.
C.
c. less than one-third as much to GDP as does a dress.
D.
d. exactly one-fourth as much to GDP as does a dress.
【单选题】What did the woman want first?
A.
A pair of black shoes.
B.
A pair of blue shoes.
C.
A black shirt and a pair of blue shoes.
【单选题】I bought shoes yesterday. shoes are very beautiful. A. a, The B. a pair of, The C. the, The D. a pair, The pair
A.
B.
C.
D.
D
【简答题】路基防护与加固的目的,在于防止()所引起的()和(),同时()、(),提高公路的()。
【单选题】某商品流通企业经销某种商品的变动费率为0．8，固定成本分摊为7万元，该种商品的销售单价为1400元/台。该种商品的保本销售量为（ ）台。
A.
220
B.
230
C.
240
D.
250
【单选题】which of the following statements does the professor support?
A.
The price of a pair of 1986 Air Jordans in Japan is unbelievably high because they are very useful and needed by mass-consumers.
B.
People deposited old baseball cards on the attics and storage closets in order to preserve their values.
C.
Not all antique hunters can distinguish whether it is priceless or worthless.
D.
The professor encourages people to store things they love in order to increase in value.
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