（本小题满分12分）已知等比数列{an}中，an > 0，公比q∈(0,1)，且
题型：解答题
问题：
（本小题满分12分）已知等比数列{an}中，an > 0，公比q∈(0,1)，且a1a5＋2a3a5＋a2a8＝25， a3与a5的等比中项为2.
(1)求数列{an}的通项公式；
(2)设bn＝log2an，求数列{bn}的前n项和Sn.
题型：解答题
Tasha Tudor(August 28，1919 — June 18，2008) was an American illustrator(插画家)and writer of children’s books. She received many awards and honors for her contributions to children’s literature. When people talk about her creativity in artwork，she said,“I do it to support my dogs and my four children.”Her great publishing record, the number of magazine stories that have been written about her over the years, and her admirers have no effects on her at all.
Much of Tasha’s artwork and her reading are done in the wintertime.“I love winter. It’s delightful，”she says.“I don’t have to go anywhere because I work at home. If I’m snowed in，I can stay this way for months.”She hopes for early, deep snow to protect her garden from the hardship of the New England winter，and when it comes she puts on snowshoes when she needs to get down the mile-long dirt path that leads to the road.
Given her enjoyment of winter and her fantasy(梦幻)way of life，it’s not surprising that Tasha’s Christmas is a storybook holiday. She hangs flowers over the front door. Her tree comes from the woods,
and it goes up on Christmas Eve，lit by homemade candles and decorated with her great- grandmother’s collection that dates from 1850. In a place of honor on the tree are large cookies cut into the shapes of her animals.
The grandchildren and friends get presents from Tasha’s old dolls；so do the animals and they
have their own Christmas tree. “Of course，it’s a known fact that all the animals talk on Christmas
Eve,”she has written. Small, handmade gifts fill a big wooden box
At the end 0f each year, Tasha can look back and know that her life is perfect，that she has
again ignored the twentieth century，and that the magic continues. And for the rest of us，here’s
a bit of advice, Tasha style：“Nowadays, people are so restless．If they took some tea anti spent more time rocking on the porch(门廊)in the evening listening to light music，they might enjoy life more.”
小题1:Tasha loved winter because it allowed her to ____________．
A．read stories to her grandchildren
B．show her DIY snowshoes to kids
C．stay indoors working mid reading
D．enjoy bicycle tiding along the path小题2:From the passage, we can learn that Tasha’s life is ____________．
A．modern and fashionable
B．simple and fantastic
C．lonely and hard
D．adventurous and inspiring小题3:Which of the following is TRUE about Tasha?
A．She cared little about fame.
B．She created an animal fund.
C．She wrote many stories for magazines.
D．She bought presents for her relatives.小题4:In which section of a paper can you probably read the article?
A．Travel.
B．Sports.
C．Economy.
D．People.