单项选择题

Questions 26 and 27 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
Which of the following material is NOT used to communicate with outer space life

A．Images.
B．Videos.
C．Sounds.
D．Radar.
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单项选择题
The rate of HIV AIDS infection in Washington DC
A．is lower than other areas in the US.
B．is even higher than some African nations.
C．is about 20% of the city population.
D．has decreased in the past two years.
单项选择题
Question 28 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question.
A．World Cup in South Africa.
B．police uniform change.
C．police battling obesity.
D．police losing their jobs.
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