题目

地球上赤道的周长约为(     ) A．6371千米          B．5460千米           C．40000千米     D．7000千米 答案：C．—Uncle Tom is an old friend of 　　　　. I want to see him.—OK. He will be here 　　　　.A．my father; in half an hourB．my father; for half an hourC．my father’s; in half an hourD．my father’s; for half an hour