单项选择题

It's essential that people (be) (psychological) able to resist the impact (brought about) by the transition from (planned) economy to market economy.

A．Be
B．psychological
C．brought about
D．Planned
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单项选择题
The discussion was so prolonged and exhausting that ___________the speakers stopped for refreshments.
A．at large
B．at intervals
C．at ease
D．at random
单项选择题
The number of registered participants in this year's marathon was half ____________.
A．of last year''s
B．those of last year''s
C．of those of last year
D．that of last year''s
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