Question

【題目】Think about the longest elevator ride that you’ve ever taken. Whether you rose five or 100 floors, it probably took less than a few minutes. Now imagine riding in an elevator higher and higher as it climbs for nearly a day. When you reach the top floor, prepare for views that are really out of this world. You’ll be in space!

Space elevators might sound like a crazy idea, but they’re something scientists have been working on for decades.

At the moment, riding in a capsule is the only way ordinary people can get to and from space. But those rides are very expensive---about $ 25 million per person per flight. Now scientists are making efforts to reduce the expense of those rides.

Researchers are still figuring out the details about how a space elevator might work. One idea is stretching a very long cable — more than 37,000 kilometers — up to space from the earth’s equator (赤道). Objects in space above the equator orbit (繞……的軌道飛行) the earth at the same speed that our planet turns. A weight on the end of the cable would stretch it tight. An elevator tied to the cable could use it to climb up and down.

The only problem is that besides being long, this cable must also be very strong. Storms, including hurricanes might break it. One way to solve this problem is to stretch the cable from the moon instead of from the earth. Airplanes designed to climb higher than a typical jet might take off from the earth and link up with the cable, which would be held in place by the pull of gravity from the earth. An elevator car waiting there would then take riders the rest of the way to the moon. Fueled by solar power, the elevator could transport people and materials without much expense or effort per ride.

【1】The first paragraph is presented by _____.

A. asking questions

B. analyzing causes

C. giving an example

D. making a comparison

【2】Why have scientists been working on space elevators?

A. To make trips to space cheaper.

B. To help astronauts do research in space.

C. To find a more convenient way to the moon.

D. To prove an assumption which seems crazy.

【3】 The underlined word “it” in Paragraph 3 refers to _____.

A. the weight

B. the cable

C. an object in space

D. the equator

【4】 What may make the cable stay in place on the moon?

A. The elevator car on the moon.

B. The elevator fastened to the cable.

C. The pull of gravity from the earth.

D. The speed of the moon orbiting the earth.

Answer 1

【答案】

【1】D

【2】A

【3】B

【4】C

【解析】

試題分析：本文屬于科普說明文，介紹了人們發(fā)明的能夠進入太空的電梯，以及這種電梯的工作原理。

【1】D 推理判斷題。根據(jù)第一段2、3句Whether you rose five or 100 floors, it probably took less than a few minutes. Now imagine riding in an elevator higher and higher as it climbs for nearly a day.可知作者把坐電梯5到100層的時間和做電梯做了一天的時間比較，說明這種電梯很長。所以作者通過比較的方法組織了第一段內(nèi)容。并不是提問、分析和舉例。故D正確。

【2】A 細節(jié)理解題。根據(jù)第三段最后一句Now scientists are making efforts to reduce the expense of those rides.可知科學(xué)家真正努力的解決的問題就是減低費用，使之更便宜。故A正確。

【3】B 詞義猜測題。根據(jù)本句An elevator tied to the cable could use it to climb up and down.一個電梯連接到cable上然后在用這個cable爬上爬下。所以本句中的it指代the cable。故B正確。

【4】C 推理判斷題。根據(jù)最后一段第四句Airplanes designed to climb higher than a typical jet might take off from the earth and link up with the cable, which would be held in place by the pull of gravity from the earth.本句中的which指代先行詞the cable，指cable被地球引力拉著不離開地球。故C正確。