单项选择题

Questions 23 and 24 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions. Now listen to the news. What is the news about

A．Safety of cosmetic surgery.
B．Cost of cosmetic surgery.
C．Popularity of cosmetic surgery.
D．A medical journal.
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单项选择题
The population explosion is caused chiefly by ______
A．a fall in death rates
B．a rise in birth rates
C．competition between rich and poor countries
D．an increase in the amount of food per person
单项选择题
How long does the woman spend on her business every day
A．About 3 hours.
B．About 5 hours.
C．About 7 hours.
D．About 9 hours.
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