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
In line 13, the word sparked could best be replaced by which of the following
A．Burned up.
B．Flickered.
C．Led to.
D．Discharged.
单项选择题
In what year was Baltimore established
A．1729.
B．1750.
C．1776.
D．1788.
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