Scientists are convinced______ the positive effect of laughter______ physical and mental health.
| A．of ; at | B．by ; in | C．of ; on | D．on ; at |
相关试题
The children all turned ____ the famous actress as she entered the classroom. 
| A．looked at | B．to look at |
C．to looking at | D．look at |
Edward, you play so well. But I ______ you played the piano. 
| A．didn’t know | B．hadn’t known |
C．don’t know | D．haven’t known |
She brought with her three friends, none of ______ I had ever met before. 
| A．them | B．who | C．whom | D．these |
tried phoning her office, but I couldn’t _______. 
| A．get along | B．get on | C．get to | D．get through |
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