单项选择题

已知K (NH3•H2O)=1.8×10-5，现将20mL 0.50mol•L-1的氨水与30mL 0.50mol•L-1HCl相混合，溶液中的pH值为（）
A、1.0
B、0.3
C、0.5
D、4.9

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单项选择题

胸膜摩擦音是
A、渗出性心包炎和心包积水的特征
B、纤维素性心包炎的特征
C、渗出性胸膜炎的特征
D、纤维素性胸膜炎的特征

Questions 19 to 21 are based on the passage you have just heard. 19
A、What course you are going to choose.
B、Which university you are going to apply to.
C、When you are going to submit your application.
D、How much you can afford to pay.

答案： He is self-employed.