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【单选题】
磨削时因砂轮转速快，温度高，必须使用 。A.
a：空气。
B.
b：二氧化碳。
C.
c：水。
D.
d：切削液。
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举一反三
【单选题】The book ______ is black is very terrible.
A.
it's cover
B.
whose cover
C.
its cover
D.
the cover of that
【单选题】Last week, I bought an interesting story book, _____ is very beautiful.
A.
which cover.
B.
the cover of which.
C.
its cover.
D.
the cover of whose.
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