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【简答题】
设X上的关系R 1 ，R 2 满足对称性，试证： 如果R 1= R 2, R 2= R 1 ，则R 1= R 2, R 2 = 1 ．
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【单选题】John H. Glenn, Jr. , was the first American to
A.
radio a town in Mexico
B.
build a power station
C.
orbit the earth
D.
fly over 60,000 miles
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【简答题】资产负债表中，负债类项目的排列顺序是按照（ ）进行排列的。
【单选题】---_______ is it from your home to the centre of the town? ---Only 10 minutes on foot.
A.
How often
B.
How soon
C.
How far
D.
How many
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