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

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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
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

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
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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1. 答案是A. 显然，噪音在这里应该用它的不可数名词形式；不可数名词一般情况下不加冠词，如： Who discovered electricity? the average noise level in New York 是特指，有后置定语限定，就要用 the average. average 的主要词组有： above the average 平均水准之上； below the average 平均水准之下； on the average 平均，如： A doctor's salary is 5000 dollars a month on the average.
我们还可以说 an average student 这里的average 是 ordinary, normal 的意思。没有an average of 这个词组。
2. 这道题我认为应该填： I know I should have 因为这里说的是昨天的事，本应改做而没有做的是要用完成式，如： You should have finished your homework. 同理： I should have come to ...

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两个题目都是选A
关于an average of还是the average of ，主要是区分不定冠词，和定冠词。你the可是特指哦。

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