C.They are nonexistent in nature.
D.Scientists begin to use them to build invisible cloaks. 2.A hyperlens is a more powerful tool than a traditional lens A.as it can allow scientists to see small things.
B.as it can help photographers to capture images far away. C. even if it is made of ordinary materials.
D.as it can help scientists to see even the wavelengths of visible light.
3.Scientists at the Polytechnic University of Valencia try to invent A.an acoustic cloak that can shuffle waves of light. B.an invisible cloak that can shuffle waves of sound. C.an acoustic cloak that can shuffle waves of sound. D.a cloak that is made of materials found in nature. 4.According to Sanchez-Dehesa，
A.it is of great possibility to build an acoustic cloak soon. B.it is possible to build an acoustic cloak in theory but far from reality.
C.it is totally impossible to build an acoustic cloak. D.it is theoretically impractical to build an acoustic cloak. 5.What ways are some scientists looking into to protect the island and oil rig from tsunamis? (Read the last paragraph.)
A.Surround them with metamaterials as protective shields. B.Stopping the tsunami with metamaterials hours before it reaches them.
C.Building them with larger metamaterials to keep away tsunamis. D.Using the equipment made of metamaterials to forecast arrival of a tsunami. 答案与题解：
1.C A不是正确答案，因为短文一开始的句子使用了虚拟语态，句子的意思是：如果超
材料尚未得到开发的话??。也就是说，科学家已经在研发超材料。短文的后面部分也进一步提到科学家正致力于超材料的开发。但是因为超材料尚未研发成功，科学家更没有开始使用超材料来制造隐身衣，所以B和D也不是正确选择。第二段的第一句提供了答案。
2.D A、B所述功效均是第三段中普通的lens能够达到的功效，所以不是正确选择。Hyperlens不是用普通材料制成，所以C也是错误选择。短文第四段对hyperlens做了描述，
结合第四段内容可以得到D选项提供的结论。
3.C短文的第七段提供了答案。该段的大意是：瓦伦西亚理工大学的研究者Jose Sanchez-Dehesa试图研发acoustic cloak，其原理与invisible cloak相同，只是acoustic cloak移动声波(shuffle waves of sound)，而不是移动光波(shuffle waves of light)。所以，只有C是正确的选择。
4.B 短文的第八段提供了答案。工程师Sanchez-Dehesa认为，成功开发acoustic cloak在理论上是可能的，但他对是否能成功表现出怀疑。 5.A 短文的最后一段告诉我们，科学家也在研究如何将超材料应用于抵御海啸的袭击。可以在岛屿周围使用超材料作为防护(shields)，因为超材料可以让海啸改变行走方向(redirect tsunami)。A表达了这层意思，所以是答案。文章没有说，在海啸到达之前数小时用超材料
将海啸档住，B不是答案。文章没有建议用超材料建造海岛和石油钻塔，C不是答案。D的内容是用超材料制作海啸预警器，文章中没有提及，也不是答案 完型填空新增文章（共3篇） 目录：
第三篇(C级)：What Is Coolest Gas in the Universr?
第十二篇(B级)：Smoking Can Increase Depressive Symptoms in Teens 第十五篇(A级)：Young Adults Who Exercise Get Higher IQ Scores 第三篇
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+1200℃to-120℃.The temperature depends upon （3 ）you are in direct sunlight or shade.Obviously，-120℃ 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 to a 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 1920s，Satyendra Nath Bose was studying an interesting （9） about special light particles we now call photons.Bose had trouble （10 ）other scientists to believe his theory, （11 ）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 （13 ）atoms can help them make the world’s atomic clocks even more accurate.These clocks are so accurate today they would only lose3 one 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 ），we need to know time as accurately as possible to get accurate distance. 词汇：
Antarctica n.南极洲 photon n.光子
orbit n.轨道 theorize v.推理，使理论化 NASA 美国国家航空和航天管理局 velocity n.速度 Astronomer n.天文学家 Pluto n.冥王星 注释：
1.our area：我们的这个区域。指的是太阳系中环地球的宇宙空间。 2.in this case：在这个案例中。诺贝尔物理奖一般是授予创立某种重大理论或有着重大发现的科学家。在这一案例中，两位科学家不是由于有重大科学发现而得奖，而是由于成功地将气体的温度降到接近绝对零度而得奖。 3.These clocks are so accurate today they would only lose one second?：这些钟如此精确，??
才慢1秒钟。they would only lose one second是结果状语，they之前省略了连接词that。
4.velocity times time：速度乘以时间。times是介词，意为“乘以”。 5.With：由于 练习：
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 答案与题解：
1.B本段叙述地球上记录到的最低温度是-91℃，本段最后一句的后半句显然是交代这一最低温度是在南极洲出现的。所以，occurred(发生，出现)是正确的选择。其他三个选项的词义与上下文的意思相去甚远。
2.B 通观本段，内容是叙述宇宙空间的温度。选项B的space是“宇宙空间”的意思，所以是答案。其他三个选项Earth(地球)、planet(行星)、star(恒星)在词义上都不合适。
3.A上下文的意思是：地球轨道上的温度是介乎+120℃至-120℃之间。温度的变化取决于是向阳还是背阳。whether是“是否\的意思，所以是本题的答案。 4.D上文说-120℃是宇航员无法忍受的温度，下文说美国国家航空和航天管理局生产出某种装置以protect astronauts from these temperature
extremes(保护宇航员不受极端温度的侵害)。很明显，这一装置就是“space suits”。
5.C现在讨论的内容是有关太阳系的宇宙空间的温度。本段第二句就说到太阳对温度的影响：靠近太阳的温度高一些，远离太阳的温度就低一些。所以，本题要选system。
6.D整个宇宙空间的温度是多少度呢?温度的高低取决于哪个因素呢?从四个选项分析，温度不会取决于你的education(教育)，你的status(地位)或你的knowledge(知识)，因为这不合乎逻辑。只有选location(位置)才符合上下文的意思。
7.C科学常识告诉我们，绝对零度是宇宙中的最低温度。impossible是答案。 8.A本段前面的句子说到最低温度不会低于-273℃，所以，below、within、beyond都有悖于上述论述。只有above(高于)才与上文的意思相符。