6. measuring air pressure　改写题。根据第一段“An altimeter measures this air pressure to show the altitude of the airplane, or, how high it is above sea level.”可判断。

　　7. electrical signals　直接题。根据第四段 “It calculates the height of the flying plane by sending out electrical signals to the surface below and measuring the time required for them to bounce back(反弹)．”可判断。

　　8. operate　概括题。根据第三段内容综合可得。

　　9. takes off或者leaves the airport　改写题。由第三段“The pilot adjusts his altimeter to the actual sea­level pressure before setting out from the airport…”可判断。

　　10. about 300 feet　直接题。根据第三段 “The barometer altimeter is correct within about 300 feet.”可判断。

　　Ⅳ.One possible version：

　　Liang liang is no longer what he used to be — he has changed greatly. Only a year ago, he was overweight and a little lazy. He got tired easily and did not like sport. His favorite meal was fried chicken and chips. One day, he realized that he couldn't continue like this. So, he decided to change. He started to exercise. He ran in the school playground every day. He also began eating a healthier diet of more fruits and vegetable, and less meat. These changes helped him lose a lot of weight. He is now a very happy boy in very good shape, and he is always so active. What can we learn from Liang liang to feel better and look better? We should all be careful about what we eat and make sure that we get enough exercise.

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