单项选择题


Questions 18 to 20 are based on the following passage. At the end of the conversation, you will be given 15 seconds to answer the questions.
Now listen to the passage.
What is the passage mainly about

A．Forthcoming improvements on the Internet.
B．Chinese characters on the Internet.
C．Delivery of emails on the Internet.
D．Different languages on the Internet.
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单项选择题
Why did John Hailor and William Liburdy, doctors in Boston, study 1,100 children
A．To examine whether these children were healthy.
B．To find out whether their mothers had smoked.
C．To find out why these children suffered breathing problems and lung disease.
D．To look into the effect that mother’s smoking had on their children.
单项选择题
Who enjoys the most popularity in the people of South Africa
A．Nelson Mandela.
B．Robert Mugabe.
C．Thabo Mbeki.
D．The president.
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