A．Khan teaches seventh grade math better than her teacher.

　　B．The lessons can be watched repeatedly until fully understood.

　　C．She can perfectly follow the pace of Khan's teaching.

　　D．She cannot concentrate when learning in class.

　　解析　推理判断题。根据倒数第三段第一句话和该段最后一句话可知，她之所以喜欢Khan的课，是因为这个课程可以重复听，直到最后完全懂了为止。因此B项正确。

　　答案　B

　　D

　　Re­gifting only with care

　　At this busiest gift­givingtime of the year，many of us wonder what to do with the unwanted presents we get.Is it all right to re­gift—to give the unwanted present to someone else?

　　A gift is a symbol of what a relationship means to us.The best gifts meet the needs or satisfy the desires of the receiver.A gift should be about pleasing the other person，not showing off the taste，wealth of power of the giver.We should give with the other person，not ourselves in mind.

　　Still，a friend，colleague or family member who knows us well might now and then buy us something that is the last thing we'd buy for ourselves.People in long­term relationships can be surprised at the choices in clothes，music or gadgets(小玩意) made by their friends of relatives.

　　Re­gifting creates a dilemma(窘境) because we don't want to hurt the feelings of the gift­giver，but we also feel it's wasteful not to use something that might benefit someone else.

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