国家按其结构形式的不同，可分为单一国和（）
A.独立国
B.复合国
C.附属国
D.附庸国
参考答案：B
The girl was very sad, and she seemed _____ the fact that she didn’t pass the exam.[ ]
A. telling
B. having told
C. to be told
D. to have been told
蝶阀流量调节范围不大，当开启达30%时，流量就接近（）以上。
A、80%
B、85%
C、95%
D、100%
