【单选题】
{{I}}Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20.{{/I}} Why sharks are useful for humans
A、Their tasty meat.
B.The principle of their defense system against disease.
C.Their solid skin.
D.The principle of their birth modes.
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根据网考网移动考试中心的统计,该试题:
30%的考友选择了A选项
64%的考友选择了B选项
1%的考友选择了C选项
5%的考友选择了D选项