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.
According to Obama, American troops will begin to go back home in______.

A．June, 2011
B．June, 2010
C．July, 2011
D．July, 2010
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单项选择题
Which of the following statements about new HIV infections is NOT true
A．In East Asia, new infections have fallen by about 25 %.
B．In Eastern Europe, new infections have decreased 10%.
C．New infections have dropped by 17% since 2001 worldwide.
D．In sub-Saharan Africa, new infections have decreased about 15%.
单项选择题
Some foreign students are attending smaller schools because______.
A．education there is more effective and powerful
B．it’s easy for them to make a lot of friends there
C．they are able to know everyone in the same school
D．tuition fees there are cheaper than the larger ones
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