单项选择题

On what are their research findings based

A．A survey of farmers in northern Japan.
B．Tests performed on a thousand old people.
C．The study of brain volumes of different people.
D．The latest development of computer technology.

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单项选择题

Which of the following is NOT true according to the passage

A．Before 1959 the flag had been changed 25 times.
B．Each federal department has its own official flag.
C．The national flag of the U. S. had 26 stars on it after admission of Hawaii into the Union in 1959.
D．In 1912, there had been 48 states in the Union.

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.