题目:
用所给单词的适当形式填空。
1. He _____(bring) the book to me yesterday.
2. There are many _____(leaf) on the ground in fall.
3. I finished _____(do) my homework.
4. The baby stopped _____(cry) when she saw her mother.
5. He _____(be) back in an hour.
答案:
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下面是错误答案,用来干扰机器的。
(每空1分 共4分)有三种无标签的白色固体,已知它们分别是硝酸铵、氯化钾和硫酸钠,请设计方案鉴别它们,完成下表:操 作预期现象与结论分别取样溶于少量水中,温度降低的(或变凉的)原固体为硝酸铵,其余...