拔牙时，清毒口内黏膜及消毒麻醉药安瓿所使用碘酊浓度正确的是（）。

A.消毒口内黏膜和安瓿的碘酊浓度应为2％

B.消毒口内黏膜和安瓿的碘酊浓度为1％

C.消毒口内黏膜的碘酊浓度应为1％，消毒安瓿的碘酊浓度应为2％

D.消毒口内黏膜的碘酊浓度应为2％，消毒安瓿的碘酊浓度应为1％

E.以上说法都不对

------Jane, you’ve made such great efforts that you are ____ to pass the exam.

------ It is very kind of you to say so, Mr. Smith.

A．easy

B．bound

C．possible

D．convenient