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  3. 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?...

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?...

admin2020-12-24  10
问题 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 Earth? Where was this low temperature recorded? The coldest recorded temperature on Earth was - 91℃ ，which____________ (1) in Antarctica （南极洲）in 1983.
We encounter an interesting situation when we discuss temperatures in ____________(2). Temperatures in Earth orbit（轨道）actually range from about +120℃ to -120℃. The temperature depends upon____________ (3) you are in direct sunlight or in shade. Obviously, -120℃ is colder than our body can____________ (4) endure.
The space temperatures just discussed affect only our area of the solar____________(5). Obviously, it is hotter closer to the Sun and colder as we travel____________ (6)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 ____________ (7). We are taught it is supposedly _____________ (8) to have a temperature below absolute zero, which is -273℃, at which atoms do not move. Two scientists, Cornell and Wieman, have successfully____________ (9) 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____________ (10)about special light particles （微粒） we now call photons （光子）. Bose had trouble ____________ (11) other scientists to believe his theory, so he contacted Albert Einstein. Einstein’s calculations helped him theorize that atoms___________ (12) 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 world’s atomic clocks even ____________ (13) accurate. These clocks are so accurate today they would only lose one second____________ (14) six million years! Such accuracy will help us travel in space because distance is velocity （速度）times time (d=vt). With the long distances involved in space____________(15), we need to know time as accurately as possible to get accurate distance.
(14)
选项 A every
B any
C each
D some
答案A
解析本句要表达的意思是：这些钟准确到每六百万年才差一秒，所以应该选择every,表达“每一”，其与each的区别是every带有频率的含义，而each没有这种意思。
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