单项选择题

Why is it hard for Amy to walk?
A、Because she is overweight.
B、Because she has started exercising.
C、Because she has a bad cold.
D、Because she has a cough.

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利润表中的营业收入是企业所有收入的总和，包括投资收益。( )
A、正确
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凝血因子FⅧ的作用是

A．激活FⅨ
B．使FXa对FⅡ的激活加快
C．使FⅡa对FⅠ的激活加快
D．使FⅨa对FX的激活加快