小强利用U形管压强计和装有水的大烧杯来探究液体内部压强的特点．
阅读下面这首诗，回答问题。 过山农家 【唐】顾况 板桥人渡泉声，茅檐日午鸡鸣。 莫嗔焙茶烟暗，却喜晒谷天晴。
This Sunday is grandpa's birthday. The Smith family are going to celebrate it at home, so they will have a busy weekend.
Saturday
Morning
Dad-clean the car in the garden
Mum-clean the kitchen and bedrooms of their house
Amy-have dance lessons in the gym
Rose--work on science projects in the library
Afternoon
Mum and Dad-buy some food at the supermarket
Amy and Rose-choose gifts and cards for grandpa
Evening
Watch TV together
Sunday
Mum---make a big birthday cake
Amy and Rose-wrap grandpa's gifts
Amy-help Mum cook delicious food
Rose-help Dad decorate the sitting room
Amy and Rose-give gifts to grandpa
The whole family-have a party
根据表格所提供信息，从每小题所给的A、B、C三个选项中，选出一个最佳答案。
已知函数f（x）=ax+x2﹣xlna（a＞0，a≠1）．
求函数f（x）单调区间
我国被称为“黄金水道”的河流是（ ）
