单项选择题

A．Living conditions.
B．Sunshine and fresh air.
C．Air-conditioned houses.
D．A few flowers and a few leaves.
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单项选择题
The first national flags of the United States______.
A．represented the 13 colonies which won independence in 1776
B．were flown in American colonies in 1776
C．were flown in American colonies in 1795
D．gave representation to Congress
单项选择题
A．Less than one year.B．Four years.C．Five years.D．Ten years.
A．Less than one year.
B．Four years.
C．Five years.
D．Ten years.
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