单项选择题

There were 150 ______ at the international conference this summer.

A. spectators
B. viewers
C. participants
D. onlookers
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单项选择题
They’ve lifted a two-year-long economic ______ on the country.
A. enclosure
B. restriction
C. blockade
D. prohibition
单项选择题
A(n)（）shape has four straight sides at 90°to each other, two of which are much longer than the other two.

A. square
B. oval
C. oblong
D. circular
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