She did experiment after experiment. 
她做了一个又一个实验。

English learners, old and young, gather at regular time to practise their spoken English.
老老少少会定期聚在一起操练。

 

23.   The farmers went on working, ____.
A. hours after hours     B. a hour after a hour
C. an hour after an hour  D. hour after hour

24.   The students went out of the room___.
A. one by two       B. one by one   
C. two by another   D. one by the other  

考点9.     man 意为“人类”, word 意为“消息”，space意为“太空”时

其前不用冠词.

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