Some operations require only a local anesthetic in which______. A.you have your teeth pulled or filled B.a drug is injected only into the area to be operated on C.you will receive novocaine D.both gases and drugs are to be used
A.A.you B.a C.you D.both
【参考答案】
B 解析：文章指出，部分手术只需要局部麻醉，这种麻醉剂含有一种能直接注射到实施手术的区域物质，以麻醉神经。第四段......