单项选择题

The professor gave ______ instruction to the whole class so as to make every student understand how to conduct the experiment in the lab.

A．explicit
B．afflictive
C．authoritative
D．oblivious
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单项选择题
After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and ______.
A．runs away
B．charges for
C．falls off
D．merges into
单项选择题
Difficult as it is, English study is in the long run ______ to a learner in his or her career development.
A．advantageous
B．rewarding
C．profitable
D．earning
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