A. tend to be defensive when given advice

　　B. intend to follow others’ suggestions

　　C. had better study behavioral science

　　D. should give their opinions patiently

　　8.The purpose of the passage is to advise people to ________.

　　A. do a cost-benefit analysis in daily life

　　B. treasure others’ suggestions

　　C. learn from the author’s experiences

　　D. discover potential benefits

　　C

　　Last week, we explained that the planet Mars had passed “opposition.” It passed a point opposite the Sun. This week, we tell about the planet’s surprising motion among the stars.

　　For thousands of years, people have recognized that planets travel among the stars. The planets generally follow the path taken by the Sun through the sky. The Sun’s path is called the ecliptic. The groups of stars along the ecliptic are called the Zodiac(黄道带).

　　The motion of the planets can be confusing at times. Everyone knows the Sun rises in the east and sets in the west. But this is caused by the turning motion of the Earth. Planets generally move from west to east.

　　However, Mars will appear to move backward for about two months this year. This happens because the Earth is overtaking Mars on its way around the Sun. Mars began its backward, or westward, motion on May 11th. It will start moving eastward again on July 19th.

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