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单项选择题
The terrorist attack in London conveys to us the message that
A．people in London did not feel painful.
B．we must be on the alert for terrorism.
C．we should stay at home to avoid terrorism.
D．the effort at anti-terrorism was in vain.
单项选择题
From the description in the passage, we learn that
A．monkeys are also susceptible to HIV.
B．ADS has killed 25 million people in the last 25 years.
C．vaccine has been developed to prevent AIDS.
D．AIDS can be cured by drug cocktails.
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