单项选择题

A．Dark blue.
B．Dark green.
C．White.
D．Black.
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单项选择题
A．117,000.B．17,000.C．170,000.D．1,070.
A．117,000.
B．17,000.
C．170,000.
D．1,070.
单项选择题
A．It is a thank-you letter to a medical doctor.B．It is an advertisement for vitamin B12.C．It is a letter to the editor of a magazine.D．It is a preface to a book on vitamins.
A．It is a thank-you letter to a medical doctor.
B．It is an advertisement for vitamin B12.
C．It is a letter to the editor of a magazine.
D．It is a preface to a book on vitamins.
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