单项选择题

In the long run, English learning, difficult as it is, is ______ to a learner in his or her career development.

A．profitable
B．advantageous
C．prominent
D．rewarding
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单项选择题
In his ______ to further his knowledge of the universe, man has now begun to explore space.
A．attempt
B．expedition
C．trial
D．chase
单项选择题
In the past decade skyscrapers have developed ______ in this newly emerging city.
A．homogeneously
B．simultaneously
C．spontaneously
D．anonymously
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