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【单选题】
根据形成原因，岩石可分为哪三大类?A.
碳酸盐岩、石灰岩、变质岩
B.
白云岩、岩浆岩、沉积岩
C.
岩浆岩、沉积岩、变质岩
D.
石灰岩、白云岩、碳酸盐岩
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反馈参考答案：
举一反三
【简答题】时速( )称为常速,时速( )称为中速,时速( )称为准高速或者快速,时速( )称为高速,时速( )以上称为特高速。
【单选题】To be successful in negotiations, one must ________.
A.
meet his boss at the appropriate time
B.
arrive at the negotiation table punctually
C.
be good at influencing the outcome of the interaction
D.
be familiar with what the boss likes and dislikes
【单选题】Upon reaching an/a ______ age, children are encouraged, but not forced, to “leave the nest”.
A.
appropriate
B.
potential
C.
permanent
D.
automatic
【多选题】室内排水系统中，通气管的作用有( )。
A.
阻止室外排水管道中的有害气体、虫类通过卫生器具进入室内
B.
使室内外排水管与大气相通，减少排水管内空气的压力波动
C.
保护存水弯水封不被破坏，保证排水管道的水流畅通
D.
将排水管道中的臭气和有害气体排到大气中去
【多选题】The principles of writing business letters are ( )
A.
correct grammar
B.
no punctuation
C.
appropriate layout
D.
suitable style
【单选题】Suppose we had a meal in a restaurant and the bill was 20 dollars, how much was the appropriate tip we would give to the waiter?
A.
15 cents
B.
35 cents
C.
1 dollars
D.
3 dollars
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