单项选择题

He is a scientist, () a singer as well.

A．not
B．or
C．and
D．but

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单项选择题

()is a good form of exercise for both young and old.

A．Walking
B．To walk
C．The walk
D．Walk

单项选择题

()of the river has been polluted.

A．Second-three
B．Two-three
C．Two-third
D．Two-thirds

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