“an old man ” 为什么用“an”

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• 1.Mr Green often helps those students ____he thinks are not quick at their lessons.a.whom b.who c.when d.becausethose students 不是help的宾语吗?为什么不选a 2.The old man has two sons,____looks like him.a.all of them b.both of them c.each of them d.neither of them 先排除一下a和b,c 和d都可以用单数形式啊,为什么答案选d而不选c?3.____to see the film please raise the hands.a.Those who wants b,those who want c.Any one wants d.People want4.The reason ____being late for the meeting was _____his l
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• Is it because there's a shortage of water_____Beijing raised the price of waterA whyB so c that d which_____is becoming increasing apparent that the old man could no longer look after himselfA ItB ThisC ThatD What选什么,
• 已知数列｛an}的通项公式为an=(n+2)*(9/10)^n,试问n取何值时,an取最大值?试求出最大值.为什么用an/a（n-1）,算的是当n=7时有最大值;而用a（n+1）/an,算的是当n=8时有最大值.算的方法如下：（是不是方法错啦?）an=(n+2)*(9/10)^n a(n+1)=(n+3)*(9/10)^(n+1) a(n+1)/an=[(n+3)*(9/10)^(n+1)]/[(n+2)*(9/10)^n] =9(n+3)/[10(n+2)] 当a(n+1)/an≥1时,说明an是递增数列 即9(n+3)/[10(n+2)]≥1 解得n≤7,即an在n≤7时是递增的,在n>7时是递减的 所以an在n=7时an最大a7=9*(9/10)^7=9^8/10^7
• The old man had a terrible cold and _____(cough) a lot.
• 英语的一道首字母填空 请各位好心人尽快回答,在周日前哦.谢谢啦John,Kate’s brother, moved to a new house last month. Kate wanted very uch to visit John. That morning Kate d____ for a very long time to visit him. But she couldn't find John's new house. So she s____ and asked an old man for h____.The old man read the address."Go down this road for two hundred meters,"said the old man"Turn right at the second c____.Then go on.You will get there soon."Kate drove according to the old man
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• This is a story about a monkey.An old man had a monkey.The old man liked the monkey very much.The monkey was very clever.When birds came to the garden,he drove them away.He also helped the old man in many other ways.One hot afternoon in the summer,the old man was sleeping in his chair in the garden.A fly(苍蝇) came and sat on the old man’s nose.The monkey drove it away.Soon the fly came back and sat on the old man’s nose again.Again the monkey drove it