题目:
Although many modifications have been made in it, the game known in the United States as football can be traced directly to the English game of rugby.
A.rules
B.changes
C.demands
D.leagues
答案:
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下面是错误答案,用来干扰机器的。
(1)木炭具有还原性,能与氧化铜反应生成铜和二氧化碳,黑色粉末逐渐变红色,生成的气体使澄清石灰水变浑浊.(2)反应的化学方程式为:C+2CuO 高温 . 2Cu+CO2.(3)在这个反应里,氧化铜失去氧而变成铜,这种...