题目:
Tom hopes his brother _____ to his party. [ ]
A. has come
B. to come
C. came
D. will come
答案:
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(1)验证二氧化碳用澄清石灰水,故方法为将一内壁涂有澄清石灰水的烧杯罩在蜡烛火焰的上方,观察到的石灰水变浑浊说明有二氧化碳生成.(2)检验水的产生一般观察水雾的产生,故方法为将一干而冷的烧杯罩在蜡烛...