问题 单项选择题

已知一列货运火车通过500米的隧道用了28秒,接着通过374米的隧道用了22秒,这列货运火车与另一列长96米的客运火车相对而过,用了4秒钟,问这列客运火车的速度是多少

A.21米/秒

B.25米/秒

C.36米/秒

D.46米/秒

答案

参考答案:B

解析: 通过题干前两个条件可以先求出货运火车的速度为(500-374)÷(28-22)=21米/秒,则该货运火车的长度为21×22-374=88米。货车与客车相对而过,此时总路程是两车车长的总和,则两车的速度和为(96+88)÷4=46米/秒,客运火车的速度即为46-21=25米/秒。

完形填空

Many young people these days are interested in extreme sports, which mean very dangerous activities that need speed, height, or a high level of physical exertion(努力). Bungee jumping, snowskating, parkour and surfing are very popular extreme sports, but mountain climbing might be the first.

In 1985, two British young men, Joe Simpson and Simon Yates became the first west faces to climb the 6344-meter Siula Grande in the Andes(安第斯山脉). On the way down, Simpson fell and broke his leg, then he slipped(滑) down and lost connection with his friend. Yates had to get for help. Simpson fell more than 100 feet and landed on a bridge of ice. Finally he crawled(爬) for three days without food or water, until he reached the camp.

On April 26, 2003, when Aron Rolston was climbing alone in Utah, his arm was caught under a 360-kilo rock and he couldn’t move. After five days of waiting for help, the 28-year-old American ran out of water and finally he cut off half his right arm with a small knife to free himself. He also bandaged(包扎) himself in order not to lose too much blood. In 2004, he wrote a book named Between a Rock and a Hard Place. “In this book,” Aron said, “I want to tell the readers the importance of making good decisions, and of being in control of one’s life.”

小题1:How many kinds of extreme sports are mentioned in the first paragraph?

小题2:Did Simpson and Yates’s disasters happen on the way up the mountain?

小题3:How did Simpson get back to the camp?

小题4:What did Aron do to save himself when he ran out of water?

小题5:Why did Aron write the book Between a Rock and a Hard Place?

单项选择题