14. How did the sheep get across the single plank?
Passage Two
Professor Wang is a physics teacher in Beijing.
Once she was explaining to one of her classes about sound.
She decided to test the students to see how well they had understood her.
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.
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