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【单选题】
计算机配置操作系统的目的是给其他程序的执行提供一个良好的环境，因此它必须使计算机______。A.
使用方便
B.
高效工作
C.
合理使用资源
D.
使用方便并高效工作
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【单选题】By success, I don’t mean ___ usually thought of when that word is used.
A.
what is
B.
that we
C.
as you
D.
all is
【简答题】Calculate the pH at which an acid indicator with K a =1. 0×10 -5 chan ges color when the indicator is 1.00×10 -3 M.
【单选题】When does Mr. Chan get frustrated with the airline?
A.
When he has to pay more to travel
B.
When the airline has empty seats
C.
When his suitcase is lost
【单选题】如图所示 矩形截面,则m~m线以上部分和以下部分对形心抽z的两个静距的( )
A.
绝对值相等，正负号相同
B.
绝对值相等，正负号不同
C.
绝对值不等，正负号相同
D.
绝对值不等，正负号不同
【单选题】The film fans all ______ when they learned that Jackie Chan and Jet Li would pair up for the first time in the action film．
A.
brought up
B.
turned up
C.
grew up
D.
cheered up
【单选题】It is a great ________ for a person to be able to drive when he is looking for a job.
A.
benefit
B.
chance
C.
advantage
D.
fortune
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