单项选择题

The hair samples used in experiment________.

A．came from INS which keeps the samples
B．were offered by the emperor’’s descendants
C．were offered by the emperor’’s servants
D．were taken directly from title emperor’’s body
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将with改成of。unconscious一般与of搭配。
单项选择题
Bicycling and jogging are good exercise to train one’’s heart because they________.
A．require a lot of strength
B．are more interesting
C．can reduce one’’s weight
D．bring one’’s heartbeat to at least 120 a minute
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