2. 外语
  3. Scientists and experts have proved that the pattern of a human being’s finger skin ______. Finger-prints have often been used a

Scientists and experts have proved that the pattern of a human being’s finger skin ______. Finger-prints have often been used a

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问题 Scientists and experts have proved that the pattern of a human being’s finger skin ______.
Finger-prints have often been used as a method of solving criminal case because it ______.
选项 A、is complicated but reliable
B、is simple and not expensive
C、is expensive but easy to do
D、can bring a lot of money
答案B
解析 根据第三段第四句“Because of the simplicity and economy of this system”，可知答案为[B]。
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