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【单选题】
过氧乙酸的使用和保管方法,不正确的是A.
易氧化分解，应现用现配
B.
不可用于纺织品的消毒
C.
5%溶液用于浸泡金属器械
D.
2%溶液用于空气消毒
E.
防高温引起爆炸
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反馈参考答案：
举一反三
【单选题】What can't a good hearty laugh help do?
A.
reduce weight
B.
connect you to others
C.
lower blood pressure
D.
protect the heart
【单选题】It was such a funny show that people couldn’t help__________ again and again.
A.
laugh
B.
to laugh
C.
laughing
【单选题】A laugh can help people over an (awkward) situation.
A.
极大的
B.
令人尴尬的；笨拙的；棘手的；不方便的
C.
坚定自信的
【单选题】The story was so funny that we
( ) A. couldn't help laugh B. can't but laugh C. couldn't help laughing D. couldn't help but to laugh
A.
a
B.
b
C.
c
D.
d
【简答题】I can’t help _____ (laugh) at his joke.
【单选题】After hearing the funny joke, my father can't help _______. [ ]
A.
laugh
B.
laughing
C.
to laugh
D.
laughs
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