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[单选题]
Choosing a mobile phone for personal use is not an easy task because technology ________ so fast.(1分)
A
has changed
B
would change
C
changed
D
is changing
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参考答案
试题答案：
D
答案解释：
解题思路：结合句意用现在进行时表达技术现在的影响力
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21.Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.
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She failed her entrance examination for college and was unable to start her studies at college.(1分)
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