题目内容

设A={a,b,c,d}, B={a,c}, A-B=( )?

A. {a,c}
B. {b,d}
C. {a,b,c,d}
D. {a,c,d}

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P(A)∪P(B)=P(A∪B)

A. 对
B. 错

设A={{a},{a,b,c},{b,d},{c,e}}

设A，B, C 都是集合，请将相等的集合连线。

1. According to the time table, the train for London ___ at seven o’clock in theevening.

A) was leaving
B) has left
C) leaves
D) will leave