单项选择题

Their distribution is also, sometimes, widely spaced, in places, closely packed together. ______

A．various
B．alternative
C．variable
D．conventional
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单项选择题
The White House spokesman didn't______ any details concerning the disarmament talk.
A．expose
B．disclose
C．enclose
D．impart
单项选择题
Your service is entirely ______ not compulsory.
A．selective
B．optional
C．voluntary
D．reluctant
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