接到订单，小范开始对电脑组装，开开始工作速度比较慢，后经过培训后，每天组装20台，照这样的速度可以提前1天完成。可由于他工作4天后，对技术进行了改进，每天可多组装5台，结果提前3天完成了订单，问这批订单的数量有多少台?（ ）。
A．260
B．280
C．270
D．300

《旅游投诉暂行规定》规定，被投诉者应在接到通知后做出“书面答复”，“书面答复”应载明的事项包括（）．

A．被投诉的事由
B．调查核实的过程
C．基本事实与证据
D．责任及处理意见

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Write a note of about 50 - 60 words based on the following situation: Your friend, Mary, asked you to borrow a book from the library on American foreign policy. You have tried but failed to find it. Write her a note, making an apology to her and promising her to borrow one from your classmates. Marks will be awarded for content, organization, language and appropriateness. 点击查看答案