单项选择题


Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
Now, listen to the news.
The fire was brought under control ______.

A．within 20 minutes
B．within 30 minutes
C．within 40 minutes
D．within two hours
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单项选择题
Hamburger places usually play fast background music because ______.
A．they think that will make the attendants work faster
B．they believe fast music can make people eat more
C．it shortens eating time to allow more customers coming and going
D．hamburgers will become more popular
单项选择题
How can sharks find their quarries
A．By good sense of water waves made by quarries.
B．By good sense of smell and electrical magnetic power.
C．By good sense of light.
D．By good sense of blood.
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