相对于非概率抽样而言，概率抽样的特点不包括（ ）。

(单选题)There are lots of places of interest ( ) in our city. (单选题)( ) enough time and money, the researchers would have bee (单选题)( ) no cause for alarm, the old man went back to his room (单选题)See the clouds! It ( ) rain! (单选题)I ( ) writing the paper as scheduled, but my mother's ill (单选题)The student said there were a few points in the essay he ( (单选题)Nowadays a lot of adults go to evening schools ( ) furthe (单选题)If you really have to leave during the meeting, you'd better (单选题)To my horror, I saw, ( ) my father's shoulder, a gorilla. (单选题)I think you can take a(n) ( ) language course to improve