单项选择题

The whole program is well designed, but some details need further ______ by some experts.

A．proofing
B．modifying
C．demonstrating D, polishing
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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
单项选择题
The earthquake happened in south Xinjiang on Feb. 24. This ______ killed 266 people.
A．causality
B．collapse
C．calamity
D．crater
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