C.Thousands of sharks die and about 10 to 15 humans are killed by sharks each year

　　in Africa and Australia since this new system was put into use.

　　D.Using the electric wall method instead of nets to protect bathers would avoid the

　　needless death of many sharks.

　　解析：细节推断题。根据最后三段的内容可知C是错误的。

　　答案：C

　　B

　　Bird flu kills more than 60 percent of its human victims，but doesn't easily pass from person to person.Swine flu can be spread with a sneeze or handshake，but kills only a small number of people it infects.So what happens if they mix？

　　This is the scenario that has some scientists worried：The two viruses meet—possibly in Asia，where bird flu is endemic(地方病)—and combine into a new disease spreading around the world.

　　Scientists are unsure how likely this possibility is，but note that the new swine flu strain(变种) —a never­before­seen mixture of pig，human and bird viruses—has shown itself to be especially skilled at snatching genetic material from other flu viruses.

　　“This particular virus seems to have this unique ability to pick up other genes，”said leading virologist Dr. Robert Webster，whose team discovered an ancestor of the current flu virus at a North Carolina pig farm in 1998.

　　The current swine flu strain—known as H1N1—has sickened more than 2,300 people in 24 countries.While people can catch bird flu from birds，the bird flu virus—H5N1—does not easily jump from person to person.It has killed at least 258 people worldwide since 2003.

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