单项选择题

What is the writer’s main point

A．Animals yawn for a number of reasons.
B．Yawning results only from fatigue or boredom.
C．Human yawns are the same as those of other animals.
D．Only social animals yawn.

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单项选择题

Which of the following statements about the Baltimore of 1812 can be inferred from the passage

A．It did not take the way the city did in 1790.
B．It did not have many factories.
C．It was not an enjoyable place in which to live.
D．It could not grow any larger.

单项选择题

In what year was Baltimore established

A．1729.
B．1750.
C．1776.
D．1788.