单项选择题

"HELP US TO HELP YOU" means ______ .

[A] sometimes your help is not necessary
B. you can make it easier for us to help
C. usually we cannot help you
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单项选择题
How many building places does the Building Service look at each month to see if things are going on well
A．
[A] 700.

B．
[B] 900.

C．
[C] We don't know.
单项选择题
Some people enjoy sitting on the second floor of a big bus because ______ .
[A] it is no danger
B. there are fewer people there
C. they can have a better view of the city
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