单项选择题

The greatest truths are perhaps those which, being simple in themselves, ______ a large and complex body of knowledge.

A．enlighten
B．illustrate
C．lighten
D．illuminate
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单项选择题
Some educators try to put students of similar abilities into the same class because they believe this kind of ______ grouping is advisable.
A．homogeneous
B．instantaneous
C．spontaneous
D．anonymous
单项选择题
Vostok is close to the coldest spot in the world, where an ______ minus 128.6°F was recorded in 1983.
A．unreliable
B．extra
C．incredible
D．impossible
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