Question

17．How many things can you see in the night sky？A lot!On a clear night you might see the Moon，some planets，and thousands of sparkling stars．
    You can see even more with a telescope．And with bigger and bigger telescopes you can see more and more objects in the sky．And you can see those objects in more and more detail．
    But scientists believe there are some things in the sky that we will never see．We won't see them with the biggest telescope in the world，on the clearest night of the year．
    That's because they're invisible．They're the mysterious dead stars called black holes．
    You might find it hard to imagine that stars die．After all，our Sun is a star．Year after year we see it up in the sky，burning brightly，giving us heat and light．The Sun certainly doesn't seem to be getting old or weak．But stars do burn out and die after billions of years．
    As a star's gases burn，they give off light and heat．But when the gas runs out，the star stops burning and begins to die．
    As the star cools，the outer layers of the star pull in toward the center．The star squashes into a smaller and smaller ball．If the star was very small，the star ends up as a cold，dark ball called a black dwarf．If the star was very big，it keeps squashing inward until it's packed together tighter than anything in the universe．
    Imagine if the Earth were crushed until it was the size of a tiny marble．That's how tightly this dead star，a black hole，is packed．What pulls the star in toward its center with such power？It's the same force that pulls you down when you jump--the force called gravity．A black hole is so tightly packed that its gravity sucks in everything--even light．The light from a black hole can never come back to your eyes．That's why you see nothing but blackness．
    So next time you stare up at the night sky，remember：there's more in the Sky than we can see!Scattered in the silent darkness are black holes--the great mystery of space．
60．According to the article，what causes a star to die？A
A．As its gases run out，it cools down．
B．It has a collision with other stars．
C．It can only live for about a million years．
D．As it gets hotter and hotter，it explodes．
61．Which of the following statements is NOT true？A
A．There is nothing as mysterious as a black hole．
B．Black holes have gravity．
C．Black holes are invisible．
D．Black holes are dead stars．
62．What happens AFTER a star dies？B
A．It becomes brighter and easier to see．
B．It becomes invisible．
C．It burns up all of its gases．
D．It fails to Earth．

Answer 1

分析 這篇文章主要向我們介紹了一些關(guān)于宇宙中星球的天文知識．利用天文望遠(yuǎn)鏡我們可以觀察到太空中更多的物體，更為詳細(xì)地了解星星．還有一些我們看不到的星星，它們靠氣體燃燒發(fā)光，當(dāng)氣體燃盡，它們便成為被叫做黑洞的神秘死星．

解答 AAB
60  A   細(xì)節(jié)理解題．根據(jù)第四段的But when the gases run out，the star stops burning and begins to die．描述，可知當(dāng)氣體燃盡，星星便停止燃燒，我們就開始看不到它們．故選A．
61   A   推理判斷題．根據(jù)第二段的But scientists believe there are some things in the sky that we will never see．可知，科學(xué)家相信天空中一定有我們從未看到的東西，所以沒有和黑洞一樣神秘的東西是錯誤的，故選A．
62    B   推理判斷題．根據(jù)第二段的that's because they're invisible．They're the mysterious dead stars called black holes．可知當(dāng)星星成為被叫做黑洞的神秘死星后就看不見了，故選B．

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