They could use information from bank e-mails to steal your identity or sell the e-mail address to other criminals to make quick cash.

　　The reported break-ins are the latest events to raise doubts about security at big and small companies. Last winter, hackers stole 40 million credit card numbers and 70 million addresses, phone numbers and other personal information from the retailer Target Corp. The brand is still working to regain its shoppers' trust.

　　John Prisco is a CEO of a security firm. He says security hacks are more common than many people and companies realize. "This issue reminds me of an iceberg, where 90% of it is actually under water," Prisco said in an e-mailed statement. So many cyber breaches today are not actually reported, because companies are losing information and they are not even aware of it. "

　　Security experts believe hackers will continue breaking into computer networks unless companies become more protective of personal information.

　　43. What did a group of Russian criminals do according to the report?

　　A. They stole e-mail addresses of the Internet users.

　　B. They destroyed the websites of some big companies.

　　C. They attacked American companies in southern Russia.

　　D. They downloaded the secret information of some banks.

　　44. According to Alex Holden, the criminals entered some websites easily because

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