问题描述：
1.Jack is too young to look after himself,____?
isn't he?还是 is he?
2.Five-year -old children are too young to go to school,______?
aren't they 还是 are they
isn't he?还是 is he?
2.Five-year -old children are too young to go to school,______?
aren't they 还是 are they
问题解答：
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