For some, the inspiration to volunteer online was far more personal. After losing his wife to cancer, Tony Selman spent many hours online helping Cancer Research to collect data on the disease. “Seeing how painful she was when my wife was dying, I determined to help scientists find a cure for cancer，” he says.

　　Interests and hobbies are also one of the factors. In 2011 Sam Luk, a designer, joined other online volunteers to try to help the police solve a murder case. Twelve years earlier the body of Ricky McCormick had been found killed in a field in St Louis, Missouri — the only clues being two encoded(译成密码)letters found in his pockets. Unable to decipher(破译)the codes, the police posted them online, calling for volunteers to help them make sense of the messages. “I'm interested in patterns and I love Sherlock Holmes，” says Luk. He spent hours every week trying to decrypt the notes, but the case remains unsolved to this day.

　　For writer Clay Shirky, some large online volunteering projects benefit millions of people, giving him a sense of achievement and generosity. He helps write Wikipedia, the world's biggest encyclopaedia(网上百科全书), which is written entirely by people willing to donate their professional knowledge without any reward.

　　1. Which of the following is the best title?

　　A. What caused Taralekar to help Imelda?

　　B. What motivates people to help others?

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