In spoken English of some areas in the US, the "r" sounds at the end of the words().

A. are dropped

B. drop

C. are being dropped

D. have dropped

诊室里应用氟凝胶后，医生要叮嘱患者

A．半小时内不进食，不漱口

B．回去漱口以清除口内残余氟

C．每天早晚应用含氟牙膏

D．要少吃甜食，多吃蔬菜

E．三个月后再作第二次