2．On December 14，NASA（National Aeronautics and Space） blasted a small but mighty telescope into space．The telescope is called WISE and is about as wide around as a trashcan．Don't let its small size fool you：WISE has a powerful digital camera，and it will be taking pictures of some the wildest objects in the known universe，including asteroids，faint stars，blazing galaxies and giant clouds of dust where planets and stars are born．
"I'm very excited because we're going to be seeing parts of the universe that we haven't seen before，"said Ned Wright，a scientist who directs the WISE project．
Since arriving in space，the WISE telescope has been circling the Earth，held by gravity in a polar orbit（this means it crosses close to the north and south poles with each lap （一圈）．Its camera is pointed outward，away from the Earth，and WISE will snap a picture of a different part of the sky every 11minutes．After six months it will have taken pictures across the entire sky．
The pictures taken by WISE won't be like everyday digital photographs，however．WISE stands for"Wide-field Infrared Survey Explorer．"As its name suggests，the WISE camera takes pictures of features that give off infrared radiation （紅外線輻射）．
Radiation is energy that travels as a wave．Visible light，including the familiar spectrum of Light（光譜） that becomes visible in a rainbow，is an example of radiation．When an ordinary digital camera takes a picture of a tree，for example，it receives the waves of visible light that are reflected off the tree．When these waves enter the camera through the lens，they're processed by the camera，which then puts the image together．
Waves of infrared radiation are longer than waves of visible light，so ordinary digital cameras don't see them，and neither do the eyes of human beings．Although invisible to the eye，longer infrared radiation can be detected as warmth by the skin．
That's a key idea to why WISE will be able to see things other telescopes can't．Not everything in the universe shows up in visible light．Asteroids，for example，are giant rocks that float through space-but they absorb most of the light that reaches them．They don't reflect light，so they are difficult to see．But they do give off infrared radiation，so an infrared telescope like WISE will be able to produce images of them．During its mission WISE will take pictures of hundreds of thousands of asteroids．
Brown dwarfs（褐矮星）are another kind of deep-space object that will show up in WISE's pictures．These objects are"failed"stars-which means they are not massive enough to jump start the same kind of reactions that power stars such as the sun．Instead，brown dwarfs simply shrink and cool down．They're so dim that they're almost impossible to see with visible light，but in the infrared spectrum they glow．
74．What is so special about WISEA？
A．Its digital camera can help astronomers to see the unknown space．
B．It is as small as a trashcan．
C．It is small in size but carries a large camera．
D．Never before has a telescope carried a digital camera in space．
75．The camera on WISED．
A．is not different from an ordinary camera
B．does not see infrared radiation while the ordinary camera does
C．reflects light that human eyes can see
D．catches the infrared radiation while the ordinary camera does not
76．Which of the following is NOT correct about"asteroids"according to paragraph 7B？
A．Asteroids do not reflect light that reaches them．
B．Asteroids float through space giving off visible light．
C．It is difficult to take asteroids'pictures by ordinary cameras．
D．The WISE telescope can take pictures of asteroids．
77．What is implied in the last paragraphC？
A．Brown dwarfs give off visible light．
B．Brown dwarfs are power stars like the sun．
C．Brown dwarfs give off infrared radiation．
D．Brown dwarfs are impossible to see with the WISE telescope．
分析 本篇文章主要介紹了WISE望遠鏡的特殊之處，它雖然體積小，但它的數(shù)碼相機能拍到任何天體，所以能夠幫助天文學家觀測到宇宙空間中的未知天文現(xiàn)象．并對為什么它比其他普通鏡頭優(yōu)越做了科學解釋．
解答 74 A．細節(jié)理解題．短文的第一段的it will be taking pictures of some the wildest objects in the known universe和第二段內(nèi)容可知，WISE 的特殊之處就在于它雖然體積小，但它的數(shù)碼相機能拍到任何天體，所以能夠幫助天文學家觀測到宇宙空間中（ in the known universe ）的未知天文現(xiàn)象．且其他選項都不是短文表達的意思． 故選A．
75．D．細節(jié)理解題．短文第四段中ordinary digital cameras don't see them，and neither do the eyes of human beings以及最后一段That's a key idea to why WISE will be able to see things other telescopes can't可知，人類的肉眼和普通相機看到的光是可見光，看不見紅外線輻射，而WISE 的相機能夠看到． 故選D．
76．B．理解判斷題．由最后一段中的they absorb most of the light that reaches them．They don't reflect light．小行星會吸收大多數(shù)光，不反射光，因此他們不會發(fā)光，B錯誤，故選B．
77．C．理解推斷題． 最后一段的第一句Brown dwarfs（褐矮星）are another kind of deep-space object that will show up in WISE's pictures，褐矮星能出現(xiàn)在WISE 照片中．而據(jù)上文對WISE 望遠鏡的描述只有WISE 望遠鏡才能拍到紅外線射線，所以推出褐矮星發(fā)出紅外射線．故選C．
點評 科教類閱讀難度比一般閱讀較大，它存在的生詞比較多，因此考生應當綜合略讀、跳讀和查讀，猜詞等閱讀技巧來做題，平時也應加強練習．
