I have an uncle in Xinjiang, she said,
Suppose I was calling him on the phone from here
and at the same time you were 25 metres away, listening to me.
Who would hear me first, my uncle or you - and for what reason?
Ma Hua at once answered,
Your uncle, professor,because sound-waves travel slower than electricity.
Good, said the professor, but then another boy raised his hand.
Yes, Li Ming? said Professor Wang.
Of course your uncle would hear you first, Limin said,
but thats because of the time difference.
When its nine oclock here,its seven oclock in Xinjiang.
15. What did Professor Wang do to check whether the students understood her or not?
16. How did Ma Hua make such a judgment?
17. How did Li Min give such an explanation?
Passage Three
Henry Smith taught science at the City School.
Once he went to a bookstore and bought some books.
Most of which were expensive ones.
He left them in his car in a quiet street.
Then he went and bought some other things at other shop.
At 6 oclock he came back to the car.
One window was open - and the books were gone.
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