单项选择题

How many states entered the Union between 1818 and 1912

A．30.
B．28.
C．13.
D．8.
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单项选择题
Where the stars were placed on the national flag in 1818 and 1912
A．Congress.
B．The president.
C．The government.
D．The flagmaker.
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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