Scientists are convinced _____the positive effect of laughter _____physical and mental health．
| A．of ;on | B．by; in | C．of ; at | D．on ;at |
相关试题
— May I open the window to 
let in some fresh air?
— .
| A．Come on | B．Take care | C．Go ahead | D．Hold on |
What surprised me was not what he said but he said it.
| A．the way | B．in the way that |
| C．in the way | D．the way which |
parents say and do has a life long effect on their children.
| A．That | B．Which | C．What | D．As |
Peter’s jacket looked just the same as Jack’s, but it cost his.
| A．as much twice as | B．twice as much as |
| C．much as twice as | D．as twice much as |
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