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【单选题】
In the not too distant past, viruses used to make your computer run slower. You'd get weird pop-up ads, and your computer would freeze or crash.
A.
Viruses were more powerful in the past.
B.
It used to be easy to tell if you had a virus.
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参考解析：
刷刷题刷刷变学霸
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【单选题】Symantec, a company that develops security software, says that in 2007 they identified just over 600,000 viruses and worms, but that was up to 1.6 million in 2008.
A.
The problem of cybercrime is increasing.
B.
Security software is weaker than it used to be.
【单选题】However, police in the United Kingdom and Finland just worked together to successfully find and prosecute a wanted group of criminals. This group had infected hundreds of thousands of computers...
A.
International cooperation can work when fighting cybercrime.
B.
The United Kingdom and Finland have more problems with cybercrime than other countries.