2017届北京市高考英语一轮复习综合练习：36 （含解析）_高考复习指南

　　D. had different horses or mules pulled all the way

　　66. What can we learn from the passage?

　　A. John Buttterfield got thousands of dollars for delivering mail in stagecoaches.

　　B. John Buttterfield kept his promise to deliver mail straight to the West Coast.

　　C. Passengers might be robbed by Indians when traveling through the West.

　　D. Passengers needed to pay one hundred dollars for their journey.

　　（D）

　　67. Falling objects are pulled down to the ground by

　　A. gravity B. resistance C. speed D. acceleration（加速度）

　　68. Why do people make parachutes（降落伞）?

　　A. To look pretty and colourful in the air. B. To slow down the falling speed.

　　C. To push against the air in the sky. D. To accelerate the falling movement.

　　69. Which did Galileo discover?

　　A. A heavy ball falls faster than a light ball. B. A light ball falls faster than a heavy ball.

　　C. A light ball and a heavy ball fall at the same speed.

　　D. A light ball and a heavy ball fall at different speed.

　　70. Which of the following is NOT true according to the passage?

　　A. Heavy and light objects fall equally when they are different in size.

　　B. When air resistance equals gravity, objects fall at terminal speed.

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