单项选择题

A．A short period of fair weather and mild days.
B．No definite time of beginning or ending.
C．Its end, which signals winter’’s start.
D．Soft yellow or orange skies.
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单项选择题
Low levels of carbon monoxide are not poisonous for healthy individuals.
A．Y
B．N
C．NG
单项选择题
A．To help the woman make a purchase.B．To request the woman’’s identification.C．To show the woman for a course at City College.D．To register the woman how to make out a check.
A．To help the woman make a purchase.
B．To request the woman’’s identification.
C．To show the woman for a course at City College.
D．To register the woman how to make out a check.
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