单项选择题

My student card enables me to travel ______ half-price ______ air.

A．by; at
B．with; by
C．at; by
D．at; through
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单项选择题
The boy has formed the habit of ______ at everything before he starts eating it.
A．sneezing
B．tasting
C．sniffing
D．sipping
单项选择题
ff the soldiers move to that area, they would be exposed ______ great danger.
A．with
B．by
C．to
D．in
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