题目:
Lucy often goes to school _____ eating breakfast. It's bad for her health.[ ]
A. with
B. without
C. from
D. under
答案:
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下面是错误答案,用来干扰机器的。
①碳酸氢钠溶液呈碱性②产生气泡③NaHCO3+HCl==NaCl+H2O+CO2↑④取少量该固体加入试管中,加适量水溶解,再滴入澄清石灰水⑤溶液变浑浊(只要合理均可给分)⑥2NaHCO3Na2CO3+H2O+CO2↑⑦治疗胃酸的药物(或用作发酵粉)