一道英语冠词填空题:You'll catch___cold if you are not careful.一道英语冠词填空题:--You'll catch___cold if you are not careful.--Yes.Our school doctor says that it is easy to catch____flu these days.要理由

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一道英语冠词填空题:You'll catch___cold if you are not careful.一道英语冠词填空题:--You'll catch___cold if you are not careful.--Yes.Our school doctor says that it is easy to catch____flu these days.要理由

一道英语冠词填空题:You'll catch___cold if you are not careful.一道英语冠词填空题:--You'll catch___cold if you are not careful.--Yes.Our school doctor says that it is easy to catch____flu these days.要理由
一道英语冠词填空题:You'll catch___cold if you are not careful.
一道英语冠词填空题:
--You'll catch___cold if you are not careful.
--Yes.Our school doctor says that it is easy to catch____flu these days.
要理由

一道英语冠词填空题:You'll catch___cold if you are not careful.一道英语冠词填空题:--You'll catch___cold if you are not careful.--Yes.Our school doctor says that it is easy to catch____flu these days.要理由
a 没有特指某种感冒
the 特指某种流感

a
the

不填
the

大概cold这东西涵义比较大比较不定比较虚无缥缈所以用的不定冠词a
flu这东西比较确定而且是人研究的比较深入的所以用定冠词the