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*注意事项:
—______ sour.
—It's _____ old book.
Taste it. A. 这个包不太大。
It's red and round. B. 它是酸酸甜甜
It is sweet and sour. C. 它是红红的,圆圆的。
The bag is not very big. D. 品尝一下它。
—It's a lemon.
—?
—It's sour.
—It's an orange
—It's sour and sweet.
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