单项选择题
For all its extremes, Venus is a (n)
incalculable
laboratory for researchers studying the weather and climate of earth.
A．invaluable
B．valuable
C．value
D．valueless
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单项选择题
It takes the most cool-headed and good-tempered of drivers to resist the temptation to make reprisals when subjected to uncivilized behavior.
A．challenge
B．laugh
C．revenge
D．appreciate
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单项选择题
No matter how hard you try, you can find no parallel existing between them.
A．analogy
B．angel
C．ambition
D．antique
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