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第6部分：完形填空（第51-65题，每题1分，共15分）
下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。
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 ____ （51）in Antarctica（南极洲）in 1983．
We encounter an interesting situation when we discuss temperatures in ____（52）.Temperatures in Earth orbit（轨道）actually range from about +120℃ to -120℃．The temperature depends upon ____（53）you are in direct sunlight or shade．Obviously, -120℃is colder than our body can ____（54）endure．
The space temperatures just discussed affect only our area of the solar ____（55）．Obviously，it is hotter closer to the Sun and colder as we travel ____（56）from the Sun．Scientists estimate temperatures at Pluto are about -210℃．How cold is the lowest estimated temperature in the entire universe? Again, it depends upon your ____（57）．We are taught it is supposedly ____（58）to have a temperature below absolute zero, which is -273℃，at which atoms do not move. Two scientists, Cornell and Wieman，have successfully ____（59）down a gas to a temperature barely above absolute zero．They won a Nobel Prize in Physics in 2001 for their work-not a discovery，in this case．
Why is the two scientists work so important to science?
In the 1920s,Satyendra Nath Bose was studying an interesting ____（60）about special light particles（颗粒）we now call photons（光子）．Bose had trouble ____ （61）other scientists to believe his theory，so he contacted Albert Einstein．Einsteins calculations helped him theorize that atoms ____（62）behave as Bose thought-but only at very cold temperatures.
Scientists have also discovered that ultra-cold（超冷）atoms can help them make the worlds atomic clocks even ____（63）accurate．These clocks are so accurate today they would only lose one second ____（64）six million years! Such accuracy will help us travel in space because distance is velocity times time(d=vt)．With the long distances involved in space ____（65），we need to know time as accurately as possible to get accurate distance．
51．A. operated B. opened C. offered D. occurred
52．A. space B. star C. Earth D. planet
53．A. where B. what C. when D. whether
54．A. sadly B. repeatedly C. Freely D. safely
55．A. energy B. year C. system D. rays
56．A. by B. along C. away D. With
57．A. location B education C status D knowledge
58．A. interesting B. impossible C. reasonable D. necessary
59．A. burnt B. cooled C. blown D. cut
60．A. invention B. experiment C. paper D. theory
61．A. forcing B. begging C. convincing D. ordering
62．A. will B. would C. must D. need
63．A. that B. such C. more D. much
64．A. every B. any C. each D. some
65．A. station B. craft C. age D. travel