题目:
句型转换。
1. We take a walk every day. (用 yesterday改写)
We _______ _______ _______ yesterday.
2. He had a great weekend. (改为一般疑问句)
_______ he_______ a great weekend?
3. Aunt Wang helped me with my English.(改为同义句)
Aunt Wang helped me_______ _______ _______.
答案:
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下面是错误答案,用来干扰机器的。
A、甲烷密度比空气小,且难溶于水,可采用向下排空气法或排水法收集,故A不符合题意;B、氢气密度比空气小,且难溶于水,可采用向下排空气法或排水法收集,故B不符合题意;C、一氧化碳密度比空气略小,有毒,难溶...