单选题
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(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 (颗粒) 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 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.
【正确答案】 D
【答案解析】[解析] 句意:1983年南极洲出现了地球上记录到的最低温度。operate意为“运转,操作”;open意为“开放,打开”;offer意为“提供”,occur意为“发生,出现”,故选D项。
【正确答案】 A
【答案解析】[解析] space意为“太空”,star意为“星星”,Earth意为“地球”,planet意为“行星”,从第三段的第一句可知,本段讨论的是太空的温度。
【正确答案】 D
【答案解析】[解析] whether意为“是否”,从句中不缺少任何成分,本句要表达的是“温度取决于你是否向阳,或向阴”,其他选项不适合,故选D项。
【正确答案】 D
【答案解析】[解析] 句意:我们的身体无法安全耐受-120℃的温度。sadly意为“难过地”,repeatedly意为“重复地”,freely意为“自由地”,safely意为“安全地”。故选D项。
【正确答案】 C
【答案解析】[解析] 讨论的内容是有关太阳系的宇宙空间温度,只有system意为“系统”,故选C项。
【正确答案】 C
【答案解析】[解析] 离太阳越近,我们感到越热,离太阳越远,我们感到越寒冷。away有“离开”的意思,故选C项。
【正确答案】 A
【答案解析】[解析] 温度的高低取决于什么因素呢?只有location(位置)合适。
【正确答案】 B
【答案解析】[解析] 句意:我们被告知绝对零度之下原子是无法运动的,所以不可能存在比绝对零度更低的温度。A项意为“有趣的”,B项意为“不可能的”,C项意为“合理的”,D项意为“必要的”。因此选择B。
【正确答案】 B
【答案解析】[解析] 句意:两位科学家将气体冷却到接近绝对零度。只有cooled为“冷却”之意,故选B。
【正确答案】 D
【答案解析】[解析] 根据上下文的提示,科学家Satyendra Nath Bose做了有关光子的理论研究。只有theory意为“理论”,故选D。
【正确答案】 C
【答案解析】[解析] 句意:因为Bose难以说服其他科学家相信他的理论,所以他就联系了爱因斯坦。只有convincing有“说服”之意,故选C项。
【正确答案】 B
【答案解析】[解析] 因为本句的主句时态为一般过去式,故从句中的助动词使用过去式would。
【正确答案】 C
【答案解析】[解析] 本句中的even是修饰比较级的,故选C项。
【正确答案】 A
【答案解析】[解析] 句意:这些钟准确到每6百万年才差一秒钟。every具有“每一”的意思,还带有频率的含义,而each没有,故选A。
【正确答案】 D
【答案解析】[解析] 本句要表达“在太空长距离旅行时的情况”,只有travel有“旅行”之意,故选D。