对()等重点旅客做到重点照顾。
A、老、幼
B、病、残、孕
C、老、弱
D、首长、外宾
E、部标
参考答案:A,B
Our teacher is clever and hardworking, but not very good at _______ his ideas to us.
A.getting over
B.getting across
C.getting on
D.getting into
氢气温度高时,调节冷却水应缓慢,以防()。