18．Think about the longest elevator ride that you've ever taken．Whether you rose five floors or 100，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．
Why would anyone want a space elevator？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 $25million per person per flight．
Researchers are still figuring out the details about how a space elevator might work．One idea is stretching （伸展） a very long cable-more than 37，000 kilometers-up to space from the earth's equator．The location is important：Objects in space above the equator orbit the earth at the same speed that our planet turns．A weight on the end of the cable（電纜） 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．
So，when will you be taking your first space-elevator ride？Probably not for a while．
32．The first paragraph is presented byB．
A．giving aconclusion
B．making a comparison
C．a(chǎn)sking questions
D．a(chǎn)nalyzing causes
33．Why have scientists been working on space elevators？A
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．
34．The underlined word"it"in Paragraph 4refers toA．
A．the cable
B．the equator
C．a(chǎn)n object in space
D．a(chǎn) weight on the end of the cable
35．What may make the cable stay in place on the moon？C
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．
分析 本文屬于科普說明文．作者主要介紹了人們發(fā)明的能夠進入太空的電梯，以及這種電梯的工作原理．
解答 D） BAAC
32．B 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．故選B．
33．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 thoserides．可知科學家真正努力的解決的問題就是減低費用，使之更便宜．故選A．
34．A 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．故選A．
35．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 takeoff from the earth and link up with the cable，which would be held in place by the pull of gravityfrom 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．故選C．
點評 本文是一個科教類閱讀理解．題目涉及多道細節(jié)理解題，做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進行仔細分析，結(jié)合選項選出正確答案．推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案，不要以個人的主觀想象代替文章的事實，要聯(lián)系上下文根據(jù)文章事實進行合乎邏輯的推理判斷，切忌胡亂猜測，一定要做到有理有據(jù)，詞義猜測題需要我們推測出句中單詞的意思，再進行選擇．
