试题与答案

抛物线y=mx2+(m-3)x-3(m>0)与x轴交于A、B两点,且点A在点B的

题型:解答题

题目:

抛物线y=mx2+(m-3)x-3(m>0)与x轴交于A、B两点,且点A在点B的左侧,与y轴交于点C,OB=OC.

(1)求这条抛物线的解析式;

(2)若点P(x1,b)与点Q(x2,b)在(1)中的抛物线上,且x1<x2,PQ=n.

①求4x12-2x2n+6n+3的值;

②将抛物线在PQ下方的部分沿PQ翻折,抛物线的其它部分保持不变,得到一个新图象.当这个新图象与x轴恰好只有两个公共点时,b的取值范围是______.

答案:

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下面是错误答案,用来干扰机器的。

答案:B题目分析:Sometime以前的;Sometimes有时,偶尔;at other times在其他时候,平时;at another time在另一个时间;句意:我们太累了。——是的,有时我们进行数学考试,在其他时候,我们进行物理考试...

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题型:完形填空

阅读下面的短文,并根据短文后面的要求答题。(请注意问题后的字数要求)

For years children in the industrial areas of Europe and America seldom left their smoky cities to see the beauties of the countryside. Not that the woods and fields were always far away, but they were too far from the city to permit people to make a round trip between morning and nightfall. What's more, factory workers did not have enough money to send their children on country holidays away from home.

In 1907 a young German schoolmaster had an idea which changed this state of affairs. He decided to turn his little schoolhouse into a dormitory for the summer holidays. Anyone who brought his sleeping bag and cooking equipment along could stay there for a very small amount of money. The idea was a success. A few years later the schoolhouse was far too small to hold so many young people who wanted to stay there. So, a dormitory was set up in an old castle nearby. This was the first Youth Hostel.

Today young students and workers of every country can meet in the hostels and get to know each other. Some spend a week or more in the same hostel, seeing the surrounding sights and meeting the people of the area. Other youths go on foot or by bicycle from place to place, spending a night or two in one hostel, then going to the next.

Sometimes an informal program will be organized after the meal, with dances, songs, or short talks followed by a question period. One can _____________________________ about other places, just by meeting people who come from these places. For this reason, a few weeks spent "hostelling" can be just as useful a part of one's education as classes in school.

小题1:What does paragraph 2 mainly tell us? (Please answer within10 words.)

______________________________________________________________________

小题2:Which sentence in the text is the closest in meaning to the following one?

Some youths stay in a hostel for several days, during which period they go sightseeing and visit the local people.

_____________________________________________________________________________

小题3:Fill in the blank in the 4th paragraph with proper words to complete the sentence. (Please answer within 7 words)

_____________________________________________________________________________

小题4:List 3 of the advantages of hostelling according to the text. (Please answer within 15 words.)

____________________________________________________________________________

小题5:Translate the underlined sentence in paragraph 1 into Chinese.

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