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.
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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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Parliament’s trying to organize a special session______
A．a new prime minister
B．a new national security minister
C．a new speaker and deputy speakers
D．a new interior minister
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