单项选择题

No one can keep undetached by witnessing such a formidable train wreck with an unknown number of ______.

A．casualty
B．adversity
C．mischance
D．misfortune
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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
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
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