Question

4．On a clear night，the sky is a wonderful thing．Is there life out there somewhere？Is there another place like Earth where life might exist？If so，where is it？And how far away is it？
  Recently，the American Kepler spacecraft found"22b"，a planet about six hundred light years away．It is the first planet in a"habitable zone"outside the solar system．That means the planet orbits a star like our Sun，but it is not too close to it，nor too far away．Because of this position，scientists say Kepler22b might have water，one of the main things needed for life．
  The newly-discovered planet is about two and a half times larger than the Earth．It is closer to its star than we are to the Sun，but 22b's sun is smaller than ours，and doesn't produce as much heat．Scientific instruments show the new planet could be made of gases，rocks or some kinds of liquids．
  The Kepler spacecraft was named in honor of Johannes Kepler，the seventeenth century German astronomer．It was designed to examine a small part of the Milky Way galaxy and search for places like the Earth．It was made to inspect over 150，000 stars and measure how bright they are．
    If a planet passes between Kepler and the star，it blocks out part of the light．That is what suggested to scientists that there is at least one planet orbiting the star．The instruments on Kepler show the new planet as a small，black dot moving across its sun．An important part of the Kepler experiment is on the Earth．After the spacecraft gathers information，scientists use the space telescopes on the ground．
  Scientists have found over 2，300 new planets since Kepler was launched．About 200 of these are about the size of the Earth．Most are much larger，but it is the new planet's length from its star that is important．For life to possibly exist there，the planet's temperature must not be too hot or too cold．
29．What can we learn about Kepler-22b？D
A．Water must have existed on it．
B．It takes humans about 600 years to get there．
C．It is made of gases，rocks and many kinds of liquids．
D．It is the first planet outside the solar system where life may survive．
30．The Kepler spacecraft was sent into space toB．
A．show honor to Johannes Kepler
B．look for Earth-like planets in the sky
C．observe the changes of a star's brightness
D．measure the brightest star among 150，000 stars
31．In Paragraph 5 the author mainly tells usA．
A．how the Kepler system works
B．if the Kepler system sees a new planet
C．how the Kepler system uses the space telescopes
D．why an important part of the Kepler system remains on the Earth
32．What can we infer from the passage？D
A．Life may exist on the new planet in another form．
B．It is colder on the new planet because its sun is smaller．
C．Life can't exist on planets which are much larger than the Earth．
D．The new planet's length from its star decides on the possibility of life existence．

Answer 1

分析 本文属于说明文阅读，作者通过这篇文章主要向我们描述了和地球相像的行星 Kepler-22b可能适合人类生存的推测．

解答 29．D．推理判断题．根据第二段Because of this position，Kepler-22b might have water，one of the main things needed for life．可知这个星球上由生命所需的东西，所以可以推理出我们能在上面生活，故选D．
30．B．细节理解题．根据第四段It was designed to examine a small part of the Milky Way galaxy（星系）and search for places like the Earth可知它是为了检测像地球一样的星球，故选B．
31．A．细节理解题． 根据倒数第二段The instruments on Kepler show the new planet as a small，black dot moving across its sun．可知这是讲述了行星是怎样工作的，故选A．
32．D．推理判断题．根据最后一段Most are much larger，but it is the new planet's length from its star that is important．For life to possibly exist there，the planet's temperature must not be too hot or too cold可推知新行星距离太阳的远近决定了存在生命的可能性；故选D．

点评 考察学生的细节理解和推理判断能力，做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确的选择．在做推理判断题不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．