单项选择题

China and Russia have______.

A．criticized US plans to build a missile shield
B．promised further space cooperation
C．proposed a new treaty to ban nuclear tests
D．cooperated a space defense system
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单项选择题
According to the conversation, how long one should take mild exercise a day to increase one’s life span
A．Half an hour.
B．One hour.
C．Two hours.
D．45 minutes.
单项选择题
New figures published by the World Health Organization show ______. of all donated blood isn’t tested.
A．15%
B．20%
C．25%
D．30%
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