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.
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单项选择题
A．He should try a better and convenient way.B．He should give up looking for the book.C．He should ask the librarian for help.D．He should try the shelves downstairs.
A．He should try a better and convenient way.
B．He should give up looking for the book.
C．He should ask the librarian for help.
D．He should try the shelves downstairs.
单项选择题
A．Reading difficult books.B．Competing in athletic competitions.C．Talking with some friends.D．Encountering an unresolved issue.
A．Reading difficult books.
B．Competing in athletic competitions.
C．Talking with some friends.
D．Encountering an unresolved issue.
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