12．Time Travel
If you could travel in time，where would you go？Perhaps you would watch an original performance of a Shakespeare's play in Elizabethan England？What about hanging out with Laozi in the Spring and Autumn Period？Or maybe you'd voyage far ahead of the present day to see what the future holds．The possibility of time travel is indeed appealing．Stories exploring the subject have been around for hundreds of years．Perhaps the best known example is science fiction novel The Time Machine，which was written by H．G．Wells and published in 1895for the first time．It was adapted into at least two feature films of the same name，as well as two television versions，and a large number of comic book adaptations．It is generally credited with the popularization of the concept of time travel using a vehicle that allows an operator to travel purposefully and selectively．The term"time machine"，coined by Wels，is now universally used to refer to a vehicle transporting people into the far future．
But could time travel actually be possible？Some scientists say yes，in theory．They propose using cracks in time and space called"wormholes"，which could be used as shortcuts to other periods．Einstein's theory of relativity allows time travel in extreme circumstances．And British physicist Stephen Hawking saysyou could travel into the future with a really fast spaceship-going at nearly the speed of light．Though building such a spaceship would of course be no simple task．
Even if you could travel into the past，there is something called the"grandfather paradox"．It asks what would happen if a time traveler were to go back in time and have is own grandfather killed for some reason，and therefore prevent himself from being born．If the time traveler wasn't born，how would he travel back in time？
And would you really like to visit the future？In H．G．Wells'book，the main character travels into distant time where he arrives at a beach and is attacked by giant crabs．He then voyages 30million years into the future where the only living thing is a black object with tentacles（觸角）．
If that's what's in store，maybe we are better just living in the present day after all．
28．The novel The Time Machine mentioned in Paragraph 2aims to showA．
A．People's interest in time travel
B．the special feature of the book
C．the long history of time travel
D．the contribution of H．G．Wells
29．Einstein's and Hawking's theoriesD．
A．have similarities in many ways
B．push the invention of the first spaceship
C．have proved wrong by some time travelers
D．suggest the possibility to invent the time machine
30．In Paragraph 4，"grandfather paradox"probably refers to the idea thatC．
A．the traveler is prevented from meeting his grandfather
B．the traveler goes back in time to seek for his grandfather
C．the grandfather's death makes the traveler's birth impossible
D．The reunion of the traveler and his grandfather brings happiness
31．According to the passage what is probably the author's attitude towards time travel？B
A．Unclear．
B．Skeptical．
C．Supportive．
D．Unconcerned．
分析 本文是一篇科教類閱讀，主要講了"時間旅行"的歷史，并探討了時間旅行的可能性及可能會發生的事情；作者在末段表達了自己對于"時間旅行"的態度．
解答 28-31．ADCB
28題答案：A 考查細節推理，根據文章中的"Stories exploring the subject have been around for hundreds of years．Perhaps the best known example is science fiction novel The Time Machine"（探索這一話題的故事已經存在幾百年了，或許最著名的例子就是科幻小說《時間機器》）可知此處舉出《時間機器》的例子是為了說明人們早就對"時間旅行"很感興趣了，因此本題答案為A選項；此題容易錯選C選項，到目前為止還沒有"時間旅行"，故談不上"時間旅行悠久的歷史"．
29題答案：D 考查細節推理，此段句首提到"But could time travel actually be possible？Some scientists say yes，in theory．"（但是時間旅行真的可能嗎？一些科學家說理論上是可能的．），后面舉了愛因斯坦的相對論表明在極端環境下進行時間旅行時可能的、霍金說可以使用一個接近光速的宇宙飛船進行時間旅行；故通過愛因斯坦和霍金的理論我們可以得知時間旅行是可能的．綜上，本題答案為D選項．
30題答案：C 考查細節推理，根據文章中的"It asks what would happen if a time traveler were to go back in time and have is own grandfather killed for some reason，and therefore prevent himself from being born．If the time traveler wasn't born，how would he travel back in time？"（"祖父悖論"提出一個問題：如果時間旅行者在時間隧道中回去因為某種原因把自己的祖父給殺了，這樣的話他自己就無法出生了．如果時間旅行者沒有出生，那他怎樣可能在時間隧道中回去呢？）可知本題答案為C選項．
31題答案：B 考查細節推理，根據最后一段的"If that's what's in store，maybe we are better just living in the present day after all"（如果那樣的事情會發生，或許我們最好還是活在當下吧．）可知作者對于時間旅行的態度是"懷疑的"，故本題答案為B選項．
點評 本文是一篇科教類閱讀，題目涉及多道細節理解題，做題時結合原文和題目有針對 性找出相關語句進行仔細分析，結合選項選出正確答案．推理判斷也是要在抓住關鍵句子的基礎上合理的分析才能得出正確的答案．
