Question

7．Researchers have discovered the first Earth-sized planet．It was first marked by scientists using NASA's Kepler telescope（望遠(yuǎn)鏡），so it's called Kepler-186f．It lies about 500 light years from Earth and goes around its star．The planet is the right distance from its star for water：not too close and not too far．Water is one important condition that scientists guess is necessary for life．So it could have water and possible life．It's called a true Earth cousin．
"This planet is an Earth cousin，not an Earth twin，"said Barclay，who is among a team of scientists reporting on the discovery in the magazine Science this week．
"It's very exciting to find a planet similar to the Earth，"Barclay said．"It's not easy work because things change as we get more measurements．"
"It's possible for life to live in this planet，but that doesn't mean there is life in it．"Barclay said．
   So far，scientists have found nearly 1，800 planets in the universe．
"The past year has seen a lot of progress in the search for Earth-like planets．Kepler-186f is very important because it is the first planet that is the same temperature and is almost the same size as Earth，"scientist David Charbonneau wrote in an email．
48．Researchers have already found aboutCplanets now．
A.500  
B.186  
C.1800 
D.1801
49．Which of the following about Kepler-186f is NOT true according to the passage？A 
A．It could have water and possible life，so perhaps we might live there．
B．It's almost as hot as and as large as Earth．
C．In the future，scientists will study the air of it by telescope．
D．It's an Earth-like planet．
50．We can probably read this article inB．
A．a(chǎn) story book  
B．a(chǎn) newspaper 
C．a(chǎn) text book 
D．a(chǎn) sport magazine
51．What is the best title of the passage？D
 A．Space research．
 B．Journey to space．
 C．Is there water and possible life in Kepler-186f？
 D．Scientists discover most earth-like planet．

Answer 1

分析 文章大意：這是一篇科普知識(shí)類閱讀，短文主要介紹美國(guó)宇航局利用開普勒望遠(yuǎn)鏡發(fā)現(xiàn)第一個(gè)地球大小的行星，所以被命名為Kepler-186f．這顆行星離它所環(huán)繞的恒星正處于合適的距離范圍內(nèi)，以至于行星表面有液態(tài)水存在．Kepler-186f的發(fā)現(xiàn)是非常重要的，因?yàn)樗�是第一個(gè)與地球有相同的溫度和相同大小的行星．

解答 48．答案：C．細(xì)節(jié)理解題．根據(jù)倒數(shù)第二段So far，scientists have found nearly 1，800 planets in the universe．迄今為止，科學(xué)家已經(jīng)在宇宙中發(fā)現(xiàn)了近1800顆行星．可知，選C．
49．答案：A．推理判斷題．根據(jù)倒數(shù)第三段"It's possible for life to live in this planet，but that doesn't mean there is life in it．""生活在這個(gè)星球上是有可能的，但這并不意味著它有生命．"，可知，A選項(xiàng)"它可能有水和可能有生命，所以也許我們可以住在那里．"是不正確的．選A．
50．答案：B．題材來(lái)源題．A一本故事書．B一份報(bào)紙．C一本教科書．D一個(gè)運(yùn)動(dòng)雜志．根據(jù)第一句Researchers have discovered the first Earth-sized planet．研究人員發(fā)現(xiàn)了第一顆地球大小的行星．可知，應(yīng)該來(lái)源于一份報(bào)紙．選B．
51．答案：D．主旨大意題．根據(jù)最后一段The past year has seen a lot of progress in the search for Earth-like planets過去一年在尋找地球類行星方面取得了很大進(jìn)展．可知，短文主要介紹科學(xué)家發(fā)現(xiàn)大多數(shù)地球類行星．選D．

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