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【多选题】
爆破振动与自然地震相比，下列哪些是爆破振动的明显特征?( )A.
爆破振动持续时间很短
B.
爆破振动频率较高
C.
爆破振动主振频率受爆破类型影响大
D.
爆破振动振幅高
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【单选题】According to the writer, insurance is __________
A.
useful but too risky
B.
useful and necessary
C.
costly but worth buying
D.
cheap but not necessary
【简答题】According to the writer, insurance is _________. A) useful but too risky B) useful and necessary C) costly but worth buying D) cheap but not necessary
【单选题】He has done ______ to improve his English. [ ]
A.
something useful
B.
anything useful
C.
useful nothing
D.
useful anything
【简答题】为了使powerpoint 2010中编辑的演示文稿能在低版本的powerpoint 中打开，可以将演示文稿保存为“（）”类型演示文稿。
【单选题】一 What do you think of English ? 一 I think English is as as Chinese. A. useful B. more useful C. the most useful
A.
useful
B.
more useful
C.
the most useful
【单选题】I think Chinese is as _____ as Maths. [ ]
A.
useful
B.
more useful
C.
most useful
D.
the most useful
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