Question

20．A planet more like Earth than any yet discovered has been identified as a potential future home for mankind．Kepler 22b contains both land and water and has temperatures which average around 72 degrees （22 Celsius）．It also contains the right atmosphere to potentially support life．It is，however，600 light years from Earth．
The planet，where a year lasts 290 days，was first spotted two years ago．However，NASA scientists using the agency's Kepler space telescope have now concluded that it offers the best hope for future human habitation outside the Solar System．
One of the key factors for a planet to be habitable is that it remains about the right distance from its main star to be neither too cold nor too hot．
Bill Borucki，Kepler principal investigator at NASA Research Centre，said，"We are certain that it is in the habitable zone and if it has a surface it ought to have a nice temperature．
There are now three planets outside the system，known as exoplanets，which experts believe could potentially be occupied by future generations．

68．Which of the following is most likely to support life for a planet？D
    A．It has 290 days in a year．
    B．It contains both water and land and the right atmosphere．
    C．Its temperatures average 72 degrees （22 Celsius）．
    D．It remains proper distance from its star to have a nice temperature．
69．What does the new planet have in common with the earth？A
    A．They are habitable for mankind．
    B．They exist in the Solar System．
    C．They have almost the same days in a year．
    D．They are both 600 light years from the sun．
70．The passage is written to make it known to readers thatB．
    A．there are now three more planets inside the system
    B．NASA's Kepler space telescope finds a"new Earth"
    C．Bill Borucki has confirmed his investigation
    D．it has been two years since a new planet was spotted．

Answer 1

分析 本文为科教类说明文，文章主要介绍了新发现的与地球非常相似、适合于人类居住的星球开普勒-22b22b．这座星球在太阳系之外，离地球大约600光年；因为离主要恒星的距离适当，所以它的气温不太高也不太低；它一年有290天；系统外有3 个系外行星，专家认为将来可能会成为人类居住的地方．

解答 68．答案是D．细节理解题；由第三段"One of the key factors for a planet to be habitable is that it remains about the right distance from its main star to be neither too cold nor too hot．"可知，宜居的一个关键因素是与他的主要恒星保持适当的距离，这样就不会太冷或太热，故选D．
69．答案是A．细节理解题；由文章第一句"A planet more like Earth than any yet discovered has been identified as a potential future home for mankind．"可知，这个星球比以往发现的任何星球更像地球，能够成为将来人类的家园，由此判断选A．由第二段的"it offers the best hope for future human habitation outside the Solar System．"可知，它为未来人类在太阳系以外居住提供了希望，故判断它不属于太阳系，排除B；由第二段第一句中"a year lasts 290 days"判断C错误；第一段的最后一句"It is，however，600 light years from Earth．"可知开普勒-22b22b离地球600光年，排除D．
70．答案是B．主旨大意题；文章主要介绍了新发现的与地球非常相似、适合于人类居住的星球开普勒-22b22b，故选B．

点评 阅读要在整体理解文章的基础上，根据题干中关键词定位细节，然后对照选项做出合理的判断．如果是主旨大意的判断要把握文章整体，避免以偏概全．