2019年mpa考试英语真题——介词和介词短语2420

{01}Scientists are convinced    the positive effect of laughter   physical and mental health. A.of; at B.by; in C.of; on D.on; at 解析：be convinced of 确信。effect on……，有关于------方面的影响。
本题选C。
{02}The house still needed a lot of work, but _______the kitchen was finished. A.instead B.altogether C.at once D.at least 解析：in stead代替，相反；altogether一起；at once立刻，马上；at least至少。题意是“这房子还需要做很多工，不过厨房至少已经完工了。”故选D项。
本题选D。