单词辨音 在A、B、C、D四个选项中，选出划线部分读音与其余三个不同的选项，并将该选项填入答题卷上相应的空格内。（本大题共5分，每小题0.5分）
He’s been to the Great Wall,?
We believe scientists will a way to solve the problem of air pollution.
You had better _____ home at once . Don’t keep your mother _____ .
Remember ______ the book in time when you have finished _____ it .
It willabout half an hour to get to the zoo by bus.
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