设为两条直线，为两个平面，则下列结论成立的是(　　)

A：若且，则

B：若且，则

C：若，则

B. Look at Tom. He is walking (走路）on the beach. He is very hot.

C. —Are the children collecting shells on the beach?—Yes, they are.

D. Look at John and Lily. They are flying kites in the park. They are happy.

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