单项选择题

A．Increase the sample number.
B．Extend the time of the study.
C．Observe the sample group of vegetarians.
D．Both A and B.
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单项选择题
A．Negative.B．Critical.C．Neutral.D．Positive.
A．Negative.
B．Critical.
C．Neutral.
D．Positive.
单项选择题
A．She was too young to keep a baby.B．She had too many other children.C．She did not give up her claim to Mary.D．She had a drug addiction.
A．She was too young to keep a baby.
B．She had too many other children.
C．She did not give up her claim to Mary.
D．She had a drug addiction.
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