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【简答题】
根据对话内容，用方框内所给的句子补全对话，其中有两项是多余的。 A. I cleaned it last week. B. Can you help me? C. Sure, you can. D. I need to buy some drinks and snacks. E. OK, but I need to do my homework first. F. OK. I'll do it at once. G. Could you give me some money? A: Could I invite my friends to my birthday party on Saturday, Mum? B: 1.____________________ A: 2.____________________ B: What for? A: 3.____________________ B: Well, I am shopping tomorrow. And I can buy drinks and snacks for you. A: Oh, good. Thank you, Mum. B: Tom. could you clean your room? A: 4.____________________ B: You need to clean it again for your party. A: 5.____________________ B: Then after you finish your homework, let's clean the room.
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参考解析：
刷刷题刷刷变学霸
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【单选题】某品牌服装折扣店将某件衣服按进价提高50%后标价，再打8折（标价的80%）销售，售价为240元．设这件衣服的进价为x元，根据题意，下面所列的方程正确的是（ ）
A.
x?50%×80%=240
B.
x?（1+50%）×80%=240
C.
240×50%×80%=x
D.
x?（1+50%）=240×80%
【多选题】根据我国《合同法》的规定,在( )情形下,要约失效。
A.
拒绝邀约的通知到达要约人。
B.
要约人依法撤销要约。
C.
承诺期限届满，受要约人未作出承诺。
D.
受要约人对要约的内容作出实质性变更
E.
要约人依法撤回要约