In spite of various difficulties, he           the dream of returning to his homeland.     [ ]

A. held out                  

B. held on to      

C. held down                  

D. held off

表面麻醉易产生逾量中毒，采取防治措施中哪项错误（）

A.严格控制剂量

B.粘膜有损伤者忌用

C.于咽喉部喷雾后，不可将局麻药咽下

D.作气管内喷雾时，应加肾上腺素

E.麻醉前给予巴比妥钠或地西泮