题目:
按要求变化下列各句。
1. The boy usually has breakfast at seven o'clock. (对画线部分提问)
______ ______ the boy ______ breakfast?
2. Can your brother teach me English?(变为否定句)
Your brother _____ _____ me English.
3. We have a good time in the park.(变为同义句)
We ____ _____in the park.
4. Our English teacher usually reads English newspapers. (对画线部分提问)
_______ _______ your English teacher usually _______?
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:根据质量守恒定律:元素的种类和质量不变,100 g含钙元素60%的碳酸钙和氧化钙的混合物,则钙元素质量=60g,高温加热一段时间后,经实验测定已变成纯净物,即全部是CaO,故质量=60g÷40/56=84g,...