单项选择题

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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单项选择题
Which of the following statements is true of fraternal twins
A．They have the same blood type.
B．They can be of different sexes.
C．They have the same genes.
D．They occur at random in the population.
单项选择题
What's the woman's attitude toward the situation which the English language is in
A．Concerned.
B．Indifferent.
C．Condescending.
D．Agitate
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