单项选择题

What was the most probable cause of the air crash

A．Mechanical Failure.
B．Marijuana burning.
C．Destroyed by gunfire.
D．Heavy fog.
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单项选择题
What is the main topic of the conversation
A．The woman’s performance in her classes.
B．The woman’s nomination for an award.
C．The professor’s offer to help prepare the woman for an interview.
D．The results of the professor’s meeting with the woman’s other teachers.
单项选择题
In the author’s opinion, why do we search the stars or moon
A．Because we have made up our mind to do so.
B．Because we want to fulfil our desire for knowledge.
C．Because we want to enjoy the ecstasy of achievement.
D．Because we cannot help ourselves.
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