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单项选择题

Another term for identical twins is ______.

A．fraternal twins
B．mirror twins
C．single-egg twins
D．separate-egg twins

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单项选择题We can learn from the passage that the identical twins ______.

A．are all mirror images of each other
B．all have their own private language
C．like to live together
D．have similarities even if raised separately

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.