If you don't have much time, you            have a pet.         [ ]

A. mustn't

B. shouldn't

C. must

D. can't

利用下列试剂或加入试剂后溶液之间的相互反应，能鉴别稀盐酸、氯化钠和澄清石灰水三种无色溶液的试剂是（　　）

A．酚酞

B．硝酸钾溶液

C．氢氧化钠溶液

D．碳酸钠溶液