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单项选择题


Questions 15-18

A． There are 200 vehicles for every kilometer of roadway.
B． It has a dense population.
C． There are many museums and palaces.
D． It has many towering buildings.
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单项选择题A． What chemicals tears are composed of.B． Whether crying really helps us feel better.C． Why some people tend to cry more often than others.D． How tears help people cope with emotional problems.

A． What chemicals tears are composed of.
B． Whether crying really helps us feel better.
C． Why some people tend to cry more often than others.
D． How tears help people cope with emotional problems.

单项选择题A． Two thousand feet.B． Twelve thousand feet.C． Twenty thousand feet.D． Twenty-two thousand feet.

A． Two thousand feet.
B． Twelve thousand feet.
C． Twenty thousand feet.
D． Twenty-two thousand feet.