喝开水烫嘴,常向水面水气,并用两只杯子来回倒水,这是为什么?

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• 碘量法?
• 将下列句子变成复数形式.This is a bus.Look at the sheep.That is a tomato.He has a nice dress.That child is very lovely.The German can speak good Chinese.That is her child.There is a photo on the wall.An Englishman stood there.He is neither a baby nor a child but a grown-up.