皮皮学，免费搜题
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【单选题】
Inmarsat船站与卫星之间的上行频率/下行频率为 ()A.
6/4 GHz
B.
406/156 MHz
C.
1.6/1.5 GHz
D.
1.5/4 GHz
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【简答题】阅读理解。 Do you need friends? I'm sure your answer is 'Yes, of course. Everybody does!' You need friends when you play and when you work. If you have friends, you will feel happy. If you have no friends....
【单选题】'Do you any help when you do your homework?' 'Yes, I ' [ ]
A.
needing; need
B.
to need; do
C.
need; do
D.
need; need
【单选题】—Kangkang, the new term is coming, do you think you need a schoolbag? —Yes, I'm going to Huangshang Supermarket to buy this afternoon. [ ]
A.
it
B.
this
C.
one
D.
that
【单选题】Do you need to measure oxygen levels before entering an enclosed space?
A.
No
B.
Yes, always
C.
Yes, but not if you ventilate properly first for 24 hours
D.
Not if you measure for toxic gases
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