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
The beach is in an ideal ______ to draw tourists.
A. condition
B. situation
C. state
D. publicity
单项选择题
______, it is quite easy to drill a hole in it with laser.
A. Hard although a diamond is
B. As a diamond is hard
C. Hard as a diamond is
D. How hard is a diamond
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