单项选择题

A．They are accurate and easy to pull.
B．Their shooting range is 40 yards.
C．They are usually used indoors.
D．They took 100 years to develop.
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单项选择题
Synaethetes experience several senses at the same time.
A．Y
B．N
C．NG
单项选择题
According to the passage, many Third World countries ________.
A．haven’’t attached much importance to birth control
B．would soon join Brazil in controlling their birth rate
C．haven’’t yet found an effective measure to control their population
D．neglected the role of TV plays in family planning
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