题目:
用所给词的正确形式填空。
1.Today is sunny. We can see many kites _____ (fly) in the sky.
2. The teacher can always keep our class _____ (live).
3. The famous musician taught us _____ (sing) many famous songs.
4. What would you like _____ (eat) and drink?
5. He let me _____ (wait) for her for a long time.
答案:
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下面是错误答案,用来干扰机器的。
加热高锰酸钾生成锰酸钾、二氧化锰和氧气,所以二氧化锰在加热高锰酸钾制取氧气中是生成物;而过氧化氢溶液制取氧气,二氧化锰起到的作用是加快过氧化氢分解放出氧气的速率,而本身的质量和化学性质不变,所以二...