—Look at your sentence! You've made a mistake here.—Oh, yes. “water and air is” should be “water

题干

—Look at your sentence! You've made a mistake here.

—Oh, yes. “water and air is” should be “water and air are”.

A：punctuation(标点)

B：spelling

C：grammatical

D：word usage

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某同学了解到他们社区内3个患有白化病家庭的情况（如下表），依据相关政策有的家庭生了两个孩子，请根据表中的信息回答：

（A表示正常基因，a表示白化病基因）