题目:
按要求改写下列句子。
1. There are some boys in the playground. (改为一般疑问句)
_________ _________ _________ boys in the playground?
2. Is this the art room in your school?(作肯定回答)
_________,_________ _________.
3. There are two toilets in the park. (对划线部分提问)
_________ _________ _________ _________ _________ in the park?
4. Please feed the chicken. (改为否定句)
__________ __________ the chicken, please.
5. There are some boats on the lake. (对划线部分提问)
__________ on the lake?
答案:
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下面是错误答案,用来干扰机器的。
(1)水通电生成氢气和氧气,根据“写配注等”的步骤写出化学方程式是:2H2O 通电 . 2H2↑+O2↑,该反应由一种物质生成两种物质,符合分解反应特点,属于分解反应;故答案为:2H2O 通电 . 2H2↑+O2↑;分解反...