题目列表(包括答案和解析)
Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.
| A．of；at | B．by；in | C．of；on | D．on；at |
Scientists are convinced the positive effect of laughter_____physical and mental health.
| A．of, at | B．by, in | C．of, on | D．on, at |
Scientists are convinced _____ the positive effect of laughter _____ physical and mental health.
| A．of; at | B．by; in | C．of; on | D．on; at |
Scientists are convinced _____ the positive effect of laughter _____ physical and mental health.
A．of; at B．by; in C．of; on D．on; at
Scientists are convinced the positive effect of laughter_____physical and mental health.
A．of, at B．by, in C．of, on D．on, at
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