Scientists who study_noise say that__average noise level

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Scientists who study___noise say that____average noise level in New York is 72.5 decibels(分贝）
A./;the B./;an C.the;an D.the;the
我老是搞不清是an average of还是the average of还是什么的?把有关average的主要词组告诉我,要准确的
You were supposed to have come to yesterday's party.
I know I____,but I had to go to the station to meet my aunt.
A.should B.did C.would D.being
猜的A,呵呵

第一题选 A,由于在这里NOISE属于专家研究的一个学科,不用特指,也不用泛指,所以什么也不加,后面的是指纽约的噪音情况所以就是特指了,要加THE,这道题和AVERAGE的词组没有关系,就是考特指（THE) 泛指（A,AN)的知识.
第二题选A,我知道,我本该去的,SHOULD有应该的意思,这道题还有虚拟语气的知识,因为是第一人称用SHOULD更好点,如果是其他人称,WOULD也可以的

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