– Excuse me, sir. Where is Dr. Brown’s office?– ( )
A. You can’t ask me.
B. Pardon? I have no idea.
C. Please don’t say so.
D. Sorry, I’m new around here, too.
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– Excuse me, but can you tell me the way to the airport?–( )
A. Don’t ask that.
B. Go straight down to this street. Turn left at the first traffic lights. You can’t miss it.
C. No, I can’t say that.
D. No, you’re driving too fast.
–( )–Just over there at the second corner.
A. Hello, sir. Tell me where the station is.
B. Excuse me, could you tell me where the station is, please?
C. Good afternoon, sir. The station, please.
D. Pardon, sir. Can I get to the station, please?
将甲基橙指示剂（pKHIn = 3.4）加到一无色水溶液中，溶液呈黄色，该溶液的酸碱性为( )
A. 中性
B. 碱性
C. 酸性
D. 不能确定其酸碱性
下列哪些不是除菌过滤应具备的特点：（）
A. 高的过滤精度
B. 大的通过量
C. 强的亲水性
D. 足够的使用强度
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