隔绝式压缩氧自救器在使用（）利器刺伤、划伤气囊。
A.制止
B.防止
C.防备
D.阻碍
参考答案：B
血红蛋白种类出生时以（）为主，生后迅速下降。
155. In Beijing volunteers are making use of every minute to ______ their foreign languages because volunteers must pass a written test and an interview.
A．polish up
B．take up
C．put up
D．make up
