已知函数fx=Asinwx+φA>0,ω>0,-π<φ<π的部分图象如图所示，则函数fx的解析式为（）

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A： $f (x) = 2 \sin (\frac{1}{2} x + \frac{π}{4})$

B： $f (x) = 2 \sin (\frac{1}{2} x + \frac{3 π}{4})$

C： $f (x) = 2 \sin (\frac{1}{2} x - \frac{π}{4})$

D： $f (x) = 2 \sin (\frac{1}{2} x - \frac{3 π}{4})$

上一题下一题 0.0难度选择题更新时间:2012-06-30 09:50:58

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B

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阅读短文，掌握大意，然后从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

A little sports shop is near my house. It sells (卖) many good things for 1 . At the shop, we can buy soccer balls, 2 , basketballs and so on. Today my 3 and I go to the4 to buy a tennis racket. There are a lot of 5 . And they have different 6 . I think every racket 7 very nice. My sister chooses (选择) a black one, because black is her favorite8 . You know, my sister is a big sports fan. She has a great sports 9 at home-five soccer balls, four basketballs and many tennis balls. She really likes 10 sports.

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阅读下面一段文字，按要求回答问题。

幸福从没截径，也没有完美无瑕。幸福，其实很简单，平静地呼吸，悠然地眺望，微笑着生活。幸福，其实在路上，进一步，有一片绮丽的风景；进一步，有一生甜淡的心境。只要付出真心，潜心经营，幸福就会悄然到来。

①给文段中的划线字注音。

____	____
静	悄

②找出文段中的两个错别字，并加以改正。

____改为____，____改为____

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