原因
D的化学式是____，D溶液显碱性的原因是（用离子方程式表示）____．
D的化学式是\_\_\_\_，D溶液显碱性的原因是（用离子方程式表示）\_\_\_\_．
Nobody believed that his excuse for being late was why his car broke down on his way to work.
Nobody believed that his excuse for being late was why his car broke down on his way to work.
普通泡沫灭火器内的玻璃筒里盛有硫酸铝溶液，铁筒中盛有碳酸氢钠溶液，其化学反应的原理是____，不能把硫酸铝溶液盛在铁桶中的原因是____．
普通泡沫灭火器内的玻璃筒里盛有硫酸铝溶液，铁筒中盛有碳酸氢钠溶液，其化学反应的原理是\_\_\_\_，不能把硫酸铝溶液盛在铁桶中的原因是\_\_\_\_．
Marley started the 1,000 Black Girls Books Campaign because _____.
Marley started the 1,000 Black Girls Books Campaign because \_\_\_\__.
Which of the following is the best title for the passage?
Which of the following is the best title for the passage?
拜群众为师，是中国共产党人的永恒课题，任何时候都具有十分重要的意义。请运用历史唯物主义有关知识，说明中国共产党人为什么要拜群众为师。
拜群众为师，是中国共产党人的永恒课题，任何时候都具有十分重要的意义。请运用历史唯物主义有关知识，说明中国共产党人为什么要拜群众为师。