单项选择题

Why did the man come back

A．He was tired.
B．He had bought everything.
C．There were too many people shopping.
D．The weather was terrible.

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单项选择题

单项选择题

Which of the following statements is true according to the passage

A．Genes may contribute to some common diseases.
B．Environmental factors cause more diseases than genes.
C．It is common that most fatal diseases are caused by genes.
D．It is impossible to get clear-cut genetic answers at present.

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