练习：
1 .What is so special about WISE?
A It is small in size but carries a large camera.
B It is as small as a trashcan.
C Its digital camera can help astronomers to see the unknown space.
D Never before has a telescope carried a digital camera in space.
2. Which is NOT the synonym for the word "snap" in the third paragraph?
A make.
B shoot.
C take
D photograph.
3. The camera on WISE
A is no different from an ordinary camera.
B does not see infrared radiation while the ordinary camera does.
C catches the infrared radiation while the ordinary camera does not.
D reflects light that human eyes can see.
4. Which of the following is NOT correct about"asteroids" according to paragraph 7?
A Asteroids float through space giving off visible light.
B Asteroids do not reflect light that reaches them.
C It is difficult to take asteroids pictures by ordinary cameras，
D The WISE telescope can take pictures of asteroids
5.What is implied in the last paragraph?
A Brown dwarfs give off visible light.
B Brown dwarfs give off infrared radiation.
C Brown dwarfs are power stars like the sun.
D Brown dwarfs are impossible to see with the WISE telescope.
答案与题解：
1. C 短文的第一和第二段提供了答案。WISE 的特殊之处就在于，虽然体积小，但它的数码相机能拍到任何天体，所以能够帮助天文学家观测到宇宙空间中( in the known universe )的未知天文现象。其他选项都不是短文表达的意思。
2. A snap 是个多义词，可以解释为"拍照"，更为确切的意思是"拍快照"。这里shoot， take 和photograph 都是snap 的同义词。
3. C 短文第六段和第四段提供了答案。人类的肉眼和普通相机看到的光是visible lights ，看不见红外线辐射( infrared radiation) ，而WISE 的相机能够看到。
4. A 短文第七段第二句说并非所有的宇宙中的物体都会发出可见光，比如asteroids ，所以A是正确选项。其他选项的内容都可以在该段中找到。
5. B 最后一段的第一句说，褐矮星能出现在WISE 照片中，根据上文对WISE 望远镜的描述只有WISE 望远镜才能拍到红外线射线，所以B是正确选择。