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
During the heavy fog in the city, the traffic ______.
A．came to a standstill
B．came to an end
C．came to a conclusion
D．came to no result
单项选择题
He failed once again in his experiment, but he didn't feel ______.
A．frustrated
B．encouraged
C．puzzled
D．endangered
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