单项选择题

A．Its chemical elements must be studied.
B．Its temperature must be lowered.
C．Big spaceships must be built.
D．Its atmosphere must be changed.
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单项选择题
A．Colin’s speech was more interesting than any other speakers’.B．Colin’s speech was dull because it was too lengthy and tedious.C．Colin’s speech wasn’t very good but he will do better next time.D．Colin’s speech was good considering the difficulty of addressing so many audience.
A．Colin’s speech was more interesting than any other speakers’.
B．Colin’s speech was dull because it was too lengthy and tedious.
C．Colin’s speech wasn’t very good but he will do better next time.
D．Colin’s speech was good considering the difficulty of addressing so many audience.
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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