单项选择题

A．Reading difficult books.
B．Competing in athletic competitions.
C．Talking with some friends.
D．Encountering an unresolved issue.
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单项选择题
A．There was a long interval between cause and effect.B．The weather was difficult for us to forecast.C．Weather forecast was inaccurate.D．Ecologists didn’t appear until modern times.
A．There was a long interval between cause and effect.
B．The weather was difficult for us to forecast.
C．Weather forecast was inaccurate.
D．Ecologists didn’t appear until modern times.
单项选择题
A．She’s never been treated by Dr. Joanna.B．She’s been sitting in the waiting room too long.C．Dr. Joanna isn’t the very good choice.D．She’d like to recommend a magazine to the man.
A．She’s never been treated by Dr. Joanna.
B．She’s been sitting in the waiting room too long.
C．Dr. Joanna isn’t the very good choice.
D．She’d like to recommend a magazine to the man.
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