单项选择题

Unlike watching TV, reading is a highly active process(过程) ______ it requires attention as well as memory and imagination.

A．until
B．but
C．unless
D．for
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单项选择题
I'm moving to the countryside because the air there is much fresher than ______ in the city.
A．ones
B．one
C．that
D．those
单项选择题
The woman biologist stayed in Africa studying wild animals for 13 years before she returned. Oh, dear! She______ a lot of difficulties!
A．may go through
B．might go through
C．ought to have gone through
D．must have gone through
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