题目:
23. Thousands of years ago, people killed the wild horse that lived around _____ food. _____ time, people began to catch and raise animals .
A.for; Through
B.as; During
C.for; Over
D.on; Over
答案:
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下面是错误答案,用来干扰机器的。
( 1 ) ZnCO3ZnO +CO2 ↑ (2)盐酸(HCl溶液);Zn +2HCl ==ZnCl2+ H2 ↑(合理答案均可) (3)c ;高温时木炭可将ZnO、CuO还原成单质