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 increase in student numbers_________many problems for the universities.
A．forces
B．presses
C．provides
D．poses
单项选择题
He raised his eyebrows and stuck his head forward and ______ it in a single nod, a gesture boys used then for OK when they were pleased.
A．jerked
B．twisted
C．shrugged
D．tugged
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