填空题设f（x）是R上以2为周期的奇函数，已知当x∈（0，1）时，f（x）=log2x

Opening week specials at Munchies Food Hall.
At the corner of Green and Brown Streets in the city
Monday 7th of January until Sunday.13rd of January 2008
Feast until you’re full! Come down to Monetizes time week to enjoy the special dishes on offer it all of our food outlets. Order from the following:
●Succulent chicken rice ●spicy stays beef
●Delicious noodle dishes ●plump park chips
●seafood specialties ●crunchy vegetables
●sweet tropical fruit
10％ discount on all orders above ＄20.00

Halal food is available at the stall Malay Mood Heaven
Win Prizes and Gifts!
l Spend ＄20.00 or more and win instant prizes from our lucky draw box.
l Collect a free party balloon and whistle for each young diner.
l Enjoy a free meal if you are the first customer of the day at any of our stalls.
l Win a holiday to Western Australia. A free raffle ticket is given with every receipt. Just fill in your information and place your entry in the box provided. Winner to be announced in The strait Times on the 15th of January.
Join in the Fun!
Between 7:00 pm and 8:00 pm each evening until the 15th of January, your favorite Channel 3 television actors and singers will entertain you:
●May Lee ●Jackie Chen
●Kim Yap ●Kamal
Autograph sessions will follow each performance! And who will be our extra special mystery star? Come down on Saturday at moon to find out.
【小题1】Munchies Food Hall does NOT sell .A．lambB．beefC．porkD．chicken【小题2】The prices at Munchies are .A．lower than usualB．bargain prices for the openingC．lower far two peopleD．lower of you spend ＄21.00【小题3】Everyone who eats at Munchies well receive a .A．free raffle ticketB．lucky draw coupon C．free mealD．balloon and whistle【小题4】I will find out who has won the top to Western Australia when I .A．watch Channel 3 televisionB．come down to Munchies at moonC．read The Straits Times on the 5th of January D．attend the lucky draw at Munchies Food HallA

(答案→)A 解析：本文是一篇摘自报刊上的餐厅促销活动的广告【小题1】细节理解题。从广告的第一段可知。【小题2】细节推断题。从第三段Win Prizes and Gifts! Spend ＄20.00 or more and win instant prizes from our lucky draw box. 可知。【小题3】 细节推断题。从第三段Win Prizes and Gifts!部分可知只有A项优惠是人人可以享受到的，其它几项享受对象都有所限制。【小题4】细节理解题。从广告的第四部分黑体字标题可知。Winner to be announced in The Straits Times on the 15th of January.

这个解释是对的

这下我知道了

-log2（2-x）解析分析：先设x∈（1，2），利用周期性和符号把“2-x”转化到区间（0，1），代入函数解析式，再利用奇函数的定义和周期性，求出f（x）在（1，2）上的解析式．解答：设x∈（1，2），则-1＜x-2＜0，∴0＜2-x＜1，∵当x∈（0，1）时，f（x）=log2x，∴f（2-x）=log2（2-x），∵f（x）是R上以2为周期的奇函数，∴f（x-2）=-f（2-x）=-log2（2-x），f（x）=f（x-2）=-log2（2-x），∴f（x）=-log2（2-x），故