单项选择题

You should eat plenty of fruits, leafy vegetables and ______ cereals.

A．rough
B．coarse
C．crude
D．harsh
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单项选择题
He gave a long account of his troubles, with the implication that he needed financial aid. The underlined part means
A．illustration.
B．impression.
C．suggestion.
D．indication.
单项选择题
The first group was given five doses ______ weekly intervals.
A．at
B．in
C．on
D．for
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