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【单选题】
我国规定（）V以下的电压为安全电压。A.
36
B.
48
C.
110
D.
220
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【简答题】简述计算机网络的基本功能。
【单选题】Ways must be found to _______ our children a decent start in life.
A.
pass through
B.
assure
C.
oblige
D.
forbid
【单选题】Are you a new student?
A.
Yes, I just came here this September.
B.
I'm sixteen years old.
C.
I'm from Canada.
【简答题】Ways must be found to ___________ our children a decent start in life.
【单选题】Ways must be found to _____ the poisonous gases ____ polluting the air.
A.
protect ... from
B.
defend ... against
C.
prevent... from
D.
compare... with
【简答题】Ways must be found to pr the poisonous gases _____ polluting the air.
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