Why do the speakers choose this restaurant to have dinner?[音频]
A. it is inexpensive.
B. they liked it the last time they had dinner there.
C. they’re going to celebrate their wedding anniversary.
D. they’re going to celebrate the woman’s birthday.
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What is the woman worrying about at first?
A. She wouldn’t dare to eat the snails.
B. They might not be able to afford the food there.
C. The man wouldn’t like the French dishes in the restaurant.
D. They wouldn’t have enough time to have dinner.
What does the woman plan to order as the main course?
A. Salmon.
B. French cheese and white wine.
C. Roast duck.
D. Snails and green salad.
设A，B，C是任意集，则下列等式正确的是（）。
A-B=A∩~B
B. (A∪B)-C=(A-C)∩(B-C)
C. (A-B)∪B=A-B
D. (A∪B)∩A=A-B
设A，B，C是任意集，则下列表达不正确的是（）。
A. (A-B)⊆A
B. A⊆A∪B
C. A∪B=B当且仅当A ⊆B
D. A-B⊆A
E. ~（A∪B）=~A∪~B
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