治疗新生儿破伤风，首选的抗生素是 ()。

A．红霉素

B．青霉素

C．氯霉素

D．庆大霉素

E．新霉素

It's not always necessary to look up the words _____ the dictionary while

reading. Sometimes we need to guess.[ ]

A. on

B. in

C. at

D. from