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浙江省杭州市塘栖中学高中英语必修三:Unit4P5Listeningexercise教学课件.ppt
必修3;Listening;Listen to Part 1.;MJ: Hello, Dr Li Yanping. It’s so good of
you to talk to me. Some _______ ask us
why things always fall back to _____ if
you throw them up in the air. Could
you ________ it?
LY: Well, at first people thought it was
because the earth was the ______ of the
universe. Of course that was ______.
One day Isaac Newton watched an ____; fall to the ground. He said that
something else must be ______ the apple
back to earth. He called it “gravity”.
MJ: I see. Did people _______ his idea?
LY: They did. Later they worked out that
bigger _______ (like the sun) have
stronger gravity than _______ objects
(like our planets). If you’re travelling in
____ space, you couldnt fall back to the
earth. You’re just too far ______.;Listen to Part 2.;MJ: Does it mean there’s no ______ in space?
LY: No. In a spaceship you would feel the
pull as it got ______ to such an object.
You would travel faster and faster
________ it.
MJ: Until you hit it?
LY: Not exactly. You may _____ it very fast
and then it would throw you out into
space again. After that you would slow
down to the _____ speed.;MJ: How do you know this?
LY: In ____ Einstein said that in space large
objects make space-time bend; the
larger the object, the ______ space-time
bends. So time goes ______ in very
strong gravity.
MJ: What about ______ holes?
LY: That’s a place in space which has such
a strong ______ that nothing can escape
____ its gravity. There is a kind of edge ; around this mass. If you cross over this edge, it’s _________ for you to get back. However if you don’t cross this edge, you can still ______. Stephen Hawking has done a lot of ________ into black holes. He has shown that they “spit” things out as _____ as “eat” them.;Workbook-Listening;R: Thank
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