单项选择题

Doctors sometimes ______old cures when modem medicine doesn't work.

A．fall on
B．fall down on
C．fall back on
D．fall in upon
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单项选择题
Their ______building is located next to the park, so it is very convenient for them to have a walk after supper.
A．residential
B．presidential
C．conditional
D．accidental
单项选择题
______the people directly involved in the tourist industry may benefit, others may find that they are worse off.
A．If
B．But
C．Whereas
D．Whether
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