单项选择题

In recent years much more emphasis has been put ______ developing the students' productive skills.

A. onto
B. in

C. over
D. on
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单项选择题
That summer I drove west with a friend, and we ______ a little money doing odd jobs and as much as possible visited his relatives.
A. picked up
B. stepped up
C. put aside
D. set aside
单项选择题
Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.
A. inclined to
B. subjected to
C. prone to
D. bound to
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