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
No one could come up with an easy solution to the government's predicament-labor ______ which is caused by the wars.
A．decline
B．vacancy
C．rarity
D．shortage
单项选择题
The world-famous British Museum which houses a ______ collection of valuable books, paintings, works of arts, etc. attracts millions of visitors every year.
A．immersible
B．miscellaneous
C．overwhelming
D．unified
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