第6部分：完形填空（第51～55題，每題1分，共15分）

　　下面的短文有15處空白，請根據(jù)短文內容為每處空白確定一個最佳選項。

What Is the Coolest Gas in the Universe?

　　What is the coldest air temperature ever recorded on the Earth? Where was this low temperature recorded? The coldest recorded temperature on Earth was -91℃ which   1   in Antarctica in 1983．

　　We encounter an interesting situation when we discuss temperatures in   2  . Temperatures in Earth orbit actually range from about +120℃ to -120℃．The temperature depends upon   3   you are in direct sunlight or shade．Obviously, -l20℃ is colder than our body can safely endure．Thank NASA science for well-designed space   4   that protect astronauts from these temperature extremes．

　　The space temperatures just discussed affect only Our areal of the solar   5  ．Obviously，it is hotter closer to the Sun and colder as we travel away from the Sun．Astronomers estimate temperatures at Pluto are about -210℃．How cold is the lowest estimated temperature in the entire universe? Again，it depends upon your   6  ．We are taught it is supposedly   7   to have a temperature below absolute zero，which is-273℃，at which atoms do not move．Two scientists，whose names are Cornell and Wieman，have successfully cooled down a gas temperature barely   8   absolute zero．They won a Nobel Prize in Physics in 2001 for their work-not a discovery，in this case2．

　　Why is the two scientists' work so important to science?

　　In the l920s，Satyendra Nath Bose was studying an interesting   9   about particles we now call photons．Bose had trouble   10   other scientists to believe   11   he contacted Albert Einstein．Einstein's calculations helped him theorize   12   behave as Bose thought——but only at very cold temperatures．Scientists have also discovered that   13   atoms can help them make the world's atomic clocks even more accurate．These clocks are so accurate today they would only lose3 0ne second   14   six million years! Such accuracy will help us travel in space because distance is velocity times time4 （d=v×t）．With5 the long distances involved in space   15   to know time as accurately as possible to get accurate distance．

　　1．A opened B occurred C opposed D operated

　　2．A Earth B space C planet D star

　　3．A whether B where C what D when

　　4．A foods B beds C tools D suits

　　5．A wind B energy C system D rays

　　6．A education B status C knowledge D location

　　7. A reasonable B wonderful C impossible D necessary

　　8．A above B below C within D beyond

　　9．A invention B theory C paper D experiment

　　10．A convincing B begging C ordering D forcing

　　11．A and B though C but D so

　　12．A will B would C must D can

　　13．A ultra-small B ultra-fast C ultra-hot D ultra-cold

　　14．A any B each C every D some

　　15．A travel B research C walk D station

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