单项选择题

There ought to be less anxiety over the perceived risk of mountain climbing than______ in the public mind today.

A．exists
B．exist
C．existing
D．to exist
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单项选择题
More often than not, it is difficult to ______the exact meaning of a Chinese idiom in English.
A．exchange
B．transfer
C．convey
D．convert
单项选择题
Professor Johnson is said ______ some significant advance in his research in the past year.
A．having made
B．making
C．to have made
D．to make
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