D．It travels in a circular orbit.

　　答案　C

　　解析　推理判断题。根据文章最后一段中的“Mars’ elliptical orbit is the cause of its unusual brightening this year and its apparent large size.”可知选C。

　　4．What is the best title for the passage?

　　A．The Recent Research into Mars

　　B．The Surprising Motion of Mars

　　C．The Great Discovery on Mars

　　D．The Wonderful Mystery of Mars

　　答案　B

　　解析　标题归纳题。文章主要说的是火星的运行情况。故答案为B。

　　B

　　The media makes billions of dollars with the advertising they sell.We make our buying decisions based on what we see on TV，newspapers or magazines and also based on what everyone else who we know is buying and their decisions are also based on the media.

　　These are the effects of mass media on teenagers.They buy what they see on TV，what their favorite celebrities advertise and what is acceptable by society based on the fashion.

　　There are some positive and negative influences on teenagers.

　　Here is a positive influence example.If there is a sport that is getting a lot of attention by the media and gains popularity among their friends and society，they will be more likely to practice the sport.The result is that they will have fun with their friends and be more healthy because of the exercise they are doing.

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