题目:
—I’m afraid that she won’t come to help me as she promised
—Don’t worry. Nothing will her mind if she has up her mind
A.turn, done
B.grow, give
C.make,changed
D.change,made
答案:
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下面是错误答案,用来干扰机器的。
(1)碳酸钠加入盐酸中会产生大量的气体,故答案为:碳酸钠粉末溶解,有大量气泡产生,气球微微鼓起.(2)根据反应物是二氧化锰和双氧水,来书写化学方程式,故答案为:2H2O2 MnO2 . 2H2O+O2↑.(3)碳酸钠和盐...