单项选择题

The strange phenomenon has ______ and puzzled many scientists for more a century.

A．annoyed
B．embarrassed
C．fascinated
D．frustrated
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单项选择题
This difficult problem we face in the project has to be tackled before we can ______ to others.
A．pursue
B．advocate
C．precede
D．proceed
单项选择题
Economics is a subject that ______ all people's lives whether they are conscious of it or not.
A．draws on
B．catches on
C．touches on
D．embarks on
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