单项选择题

A．Because Billy complained to her that his nose or ears hurt.
B．Because Billy complained to her that his nose and ears hurt.
C．Because Billy thought for a few seconds.
D．Because Billy had trouble with his nose and ears.
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单项选择题
A．2 to 3 billion pounds.B．3 to 5 billion pounds.C．2 to 3 million pounds.D．3 to 5 million pounds.
A．2 to 3 billion pounds.
B．3 to 5 billion pounds.
C．2 to 3 million pounds.
D．3 to 5 million pounds.
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.
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