【单选题】

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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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

40%的考友选择了B选项

57%的考友选择了C选项

3%的考友选择了D选项

The passage seems to concentrate on ______.A．how twins are born