As is well-known, the higher we go above the earth, the ______ air we have.
A. rarer
B. rare
C. rarest
D. more rare
查看答案
What is the woman looking at？
A. Pictures of the trains from Boston to New York.
B. A map of New York.
C. A timetable.
How long will Tim stay in London？
A couple of months.
B. One year.
C. Several weeks.
What is true of the past definitions of happiness？
A. They were based on self-gratification.
B. They varied greatly.
C. They were based on lifestyles.
What happened to the ship they were talking about？
A. It was caught in fog.
B. It turned over in the storm.
C. It wrecked on a rock.
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