单项选择题

Questions 26 to 28 are based on the passage you have just heard.

A．2 to 3 billion pounds.
B．3 to 5 billion pounds.
C．2 to 3 million pounds.
D．3 to 5 million pounds.
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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.
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.
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.
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