单项选择题

Passage One Questions 26 to 29 are based on the passage you have just heard.

A．It influences the surface temperature of Mars.
B．It protects living beings from harmful rays.
C．It keeps a planet from overheating.
D．It is the main component of the air people breathe.
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单项选择题
A．Students might not consider them to be an important part of culture.B．They symbolize the rebellion of youth in the 1950’s.C．They are discussed in the students’ textbook.D．They have been worn for hundreds of years.
A．Students might not consider them to be an important part of culture.
B．They symbolize the rebellion of youth in the 1950’s.
C．They are discussed in the students’ textbook.
D．They have been worn for hundreds of years.
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