单项选择题

Questions 11 to 14 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. The passage seems to concentrate on __________.

A．how twins are born
B．how twins grow up
C．characteristics of identical twins
D．ways to distinguish twins

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单项选择题

单项选择题

Questions 11 to 14 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. The passage seems to concentrate on __________. 您的浏览器不支持 audio 元素。