单项选择题

John had difficulty swimming across the channel, but he finally succeeded on his fourth _________.

A．display
B．process
C．attempt
D．attack
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单项选择题
It is reported that there is no better _________ for mother's milk.
A．alternative
B．exchange
C．equivalent
D．substitute
单项选择题
Although it takes up much of his spare time, Mr. Smith finds stamp collecting extremely _________.
A．progressive
B．encouraging
C．rewarding
D．challenging
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