The word "cards" in Line 1 refers to ______. Which of the following statements is true according to the passage?

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问题 The word "cards" in Line 1 refers to ______.
Which of the following statements is true according to the passage?

选项 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.

答案A

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