单项选择题

A．At the age of 20.
B．By the age of 12.
C．When he was at high school.
D．When he studied in Harvard University.
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单项选择题
A．Seven or ten meals per week.B．Fourteen meals per week.C．Twenty-one meals per week.D．A free choice of paying method.
A．Seven or ten meals per week.
B．Fourteen meals per week.
C．Twenty-one meals per week.
D．A free choice of paying method.
填空题
Global warming is currently recognized as an important ______.
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