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

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单项选择题

Why were only the flags of various European nations flown over the land, during the discovery and settlement period

A．Because the flags were older than the national flag of the U. S.
B．Because the land was divided by these nations.
C．Because there was no universal flag over the land.
D．We don't know from the passage.

单项选择题

The doctor's test show that ______.

A．our brains shrink as we grow older
B．sixty - year - olds have better brains than thirty - year - olds
C．the front - section of the brain does not shrink
D．some people's brains have contracted more than other people's