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  3. Passage One Alice Walker makes her living by writing, and her poems, short stories, and novels have won many awards and fell

Passage One Alice Walker makes her living by writing, and her poems, short stories, and novels have won many awards and fell

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问题     Passage One
    Alice Walker makes her living by writing, and her poems, short stories, and novels have won many awards and fellowships for her. She was born in Eatonton, Georgia. She went to public schools there, and then to Spelman college in Atlanta before coming to New York to attend Sarah Lawrence College, from which she graduated in 1966. For a time she lived in Jackson, Mississippi with her lawyer husband and small daughter. About Langston Hughes, American Poet, her first book for children, she ,says, "After first meeting with Langston Hughes I vowed I would write a book about him for children someday. Why? Because I, at twenty-two, knew next to nothing of his work, and he didn’t scold me: he just gave me a stack of his books. And he was kind to me; I will always be grateful that in his absolute warmth and generosity he fulfilled my deepest dream (and need) of what a poet should be.
    "To me he is not dead at all. Hardly a day goes by that I don’t think of him or speak of him. Once, just before he died, when he was sick with the flu, I Look him a sack full of oranges. The joy I felt in giving that simple gift is undiminished by dine. He said he liked oranges, too."
    Passage Two
    What makes it rain? Rain falls from cloud for the same reason anything falls to Earth. The Earth’s gravity pulls it But every cloud is made of water droplets or ice crystals. Why doesn’t mm or snow fall constantly from all clouds? The droplets or ice crystals in clouds are exceedingly small. The effect or gravity on them is minute. Air currents move and lift droplets so that the net downward displacement is zero, even though the droplets are in constant motion.
    Droplets and ice crystals that behave somewhat like dust in the air make sunlight visible. To the casual observer, dust seems to act in a totally random fashion, moving about chaotically without fixed direction. But in fact dost particles are much larger than water droplets and they finally fall. The average size of a cloud droplet is only 0.0004 inch in diameter. It is so small that it would take sixteen hours to fall half a mile in perfectly still air, and it does not fall out of moving air at all. Only when the droplet grows to diameter of 0.008 inch or larger can it fall from the cloud. The average raindrop contains a million times as much water as a tiny cloud droplet. The growth of a cloud droplet to a size large enough to fall out is the cause of rain and other forms of precipitation. This important growth process is called "coalescence".
    Passage Three
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    Sales Ends Aug. 31st
    NEW YORK HEALTH & RACQUET CLUB
Ice crystals do NOT immediately fall to Earth because______.
选项
答案they are kept aloft by air currents
解析
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