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【单选题】
一氧化碳中毒属于 :A.
血液性缺氧
B.
循环性缺氧
C.
低缺氧
D.
组织性缺氧
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【单选题】This is ___that they all want to but it.
A.
a so useful book
B.
such an useful book
C.
a such useful book
D.
so useful a book
【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】I have to buy. [ ]
A.
useful something
B.
something useful
C.
useful anything
D.
anything useful
【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】I think Chinese is as _____ as Maths. [ ]
A.
useful
B.
more useful
C.
most useful
D.
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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