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.
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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 is NOT an evidence of some people's carelessness in daily commu nication
A．Their intonation is poor sometimes.
B．Their choice of words is poor.
C．Their speech is full of grammatical mistakes.
D．They fail to pronounce some words properly.
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