单词辨音。（从A、B、C、D四个选项中选出划线部分发音不一致的单词，共5小题，每小题1分，计5分。）
The old woman is seventy years old, but she _____ very young.
It’s not very safe ______ on the Internet.
— is Helen going to visit her grandparents ? — Next Sunday.
There is a traffic jam, Mr Zhang is late for school.
Mary was not born in China,________?
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