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在工程中常以伸长率将材料分为两大类,伸长率大于 5% 的材料称为
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皮皮学刷刷变学霸
举一反三
【单选题】We ____ see air but we ____ breathe it.
A.
can't, can
B.
shouldn't, must
C.
daren't, can
D.
mustn't, must
【简答题】Three things are necessary for us to keep alive. What are they? They are air, water and food. We eat food twice 46 three times a day. We drink water several times a day. We breathe air day and 47 . If...
【单选题】There _____ many kinds of birds around here, but now we seldom see them because of the air pollution. [ ]
A.
had
B.
used to have
C.
used to be
D.
are
【单选题】There _____ many kinds of birds around here, but now we seldom see them because of the air pollution. [ ]
A.
use to
B.
use to have
C.
use to be
D.
are
【单选题】—Look, there _____ many birds around here, but now we seldom see them. What a pity! —Yeah! The air pollution has caused the problem! [ ]
A.
are
B.
used to have
C.
used to be
D.
use to have
【单选题】There _____ many kinds of birds around here, but now we seldom see them because of the air pollution. [ ]
A.
use to
B.
use to have
C.
used to be
D.
are
【单选题】—Look, there_____ many birds around here, but now we hardly see them. What a pity! —Yeah! The air pollution has caused the problem!
A.
are
B.
used to have
C.
used to be
D.
use to be
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