下列属于氢的用途（）
A、合成氯化氢
B、漂白
C、金属冶炼
D、高能燃料
参考答案：A, C, D
Our monitor, who by then ______ admission to Fudan University, decided to do some part-time jobs to gain more practical experience.
A．gained
B．was gaining
C．has gained
D．had gained
酸牛奶中的乳酸钙容易被人体吸收.
