题目内容

Why don't you try shopping online? It is more convenientand you may_____ (得到折扣).

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Let's make a_____ (购物清单) before we go to the supermarket.

When you buy food, you should_____ (注意) the production date.

Excuse me, this T-shirt is too big for me. Do you have_____ (小一点的尺码吗)?

CH3COOH + HOC2H5→

A. CH3COOC2H5
B. CH3CH2OC2H5
CH2＝CH2