A client is admitted to the labor and delivery unit in active labor. She has had no prenatal care but appears to be between 32 and 35 weeks’ gestation. History reveals that she’s gravida 5, para 1, abortus 3. She tells the nurse she thinks her friend gave her a cigarette containing crack cocaine. What should the nurse do next ？（）

A．Move the precipitant delivery cart to the labor room, and notify the neonatologist on call.

B．Teach the mother controlled breathing techniques.

C．Call a family member to come to the hospital.

D．Call the friend who gave the client the cigarette and find out exactly what the drug was.

既可以得到药材中挥发性成分又可得到水煎液的浸取方法（）

A.煎煮法

B.浸渍法

C.回流法

D.水蒸气蒸馏法

E.渗漉法