如图，在△ABC中，AD⊥BC于D，BD=$\sqrt{5}$，DC=1，AC=$\sqrt{5}$，那么AB的长度是(        )

下面是一名初中生的部分日记

读欧洲西部图，完成下列问题．

如图为同一个密封的袋装食品放在手掌上的两张照片，甲图摄于海拔200m处，乙图摄于海拔3200m处。则袋装食品袋内气体不变的量是（   ）

阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。    I had my summer all planned out．I was going to enjoy the city． However, my parents had ____ different idea．They said l would be going to my grandparents' farm ____ a whole month．I felt sad．What could ____ (possible)be fun to do in the country?
    It was very hot when we arrived at the farm．So Grandpa took ____ (I)to a creek(小溪)．It felt great to jump into the cool，clear water．I ____ (begin)to think staying in the country might be ____ (interesting)than I had thought．
    The next day Grandma gave me a basket and sent me out ____(pick)strawberries．The berries were so good that a lot of them had disappeared ____ they reached my basket．
    I didn't get to visit a zoo， but l got an up-close look at pigs，cows，and ____ (chicken)．I fed the goats，milked the cows，and collected fresh eggs．
    My summer wasn't what I had expected，____ I loved it! I was sad that I had to leave．Now, I still love living in the city，but I learned that trying new things can be a lot of fun，too!