射干治疗咽喉肿痛，痰多者是取其什么功敛（）。
A.清热解毒
B.清热凉血
C.消肿散结
D.祛痰利咽
E.止咳止血
参考答案：A, D
Many students don't know the key to _____ their English is to practice more. [ ]
A. improving
B. improve
C. improved
D. improvement
油浸式变压器达到变压器过励磁限值，开展油中溶解气体分析等（）检修，根据试验结果适时安排停电检修。
A.A类
B.B类
C.C类
D.D类
