流动室的类型有（）
A.在室内检测的流动室
B.激发型流动室
C.在空气中检测的流动室
D.荧光流动室
E.显微检测流动室
参考答案：A, C, E
The little boy still needs the __________20 dollars to do with some things __________.
A．remaining；remained to be settled
B．remaining；remaining to be settled
C．remained；remained to settle
D．remained；remaining to settle
某学校1999名学生去游故宫、景山和北海三地，规定每人至少去一处，至多去两地游览，那么至少有多少人游的地方相同
A．35
B．186
C．247
D．334
