单项选择题

A．Seasonal differences in what mothers ate during pregnancy.
B．Infection occurring at different times of the year.
C．Its family background.
D．Both A and B.
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单项选择题
A．To go out for exercise.B．To go out for shopping.C．To go to the library to borrow a book on William Carlos Williams.D．To help the woman with her oral presentation.
A．To go out for exercise.
B．To go out for shopping.
C．To go to the library to borrow a book on William Carlos Williams.
D．To help the woman with her oral presentation.
单项选择题
A．Teacher.B．Doctor.C．Basketball player.D．Engineer.
A．Teacher.
B．Doctor.
C．Basketball player.
D．Engineer.
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