隋朝大运河始建于公元605年，绵延两千多千米，是一条贯通南北的交通大动脉。2014年在卡塔尔首都举行的第38届世界遗产大会上，中国大运河成功入选《世界遗产名录》。隋朝开通大运河的根本目的是（    ）

I am strongly ________ keeping animals in the zoo, because I think animals should also have the right to enjoy freedom.

    Mrs Black lived in a city of England. Her husband died two years ago and one of her children worked in the capital and the other three lived in another town. Her husband didn't leave her much money and she had to live a simple life. Sometimes her children went to see her during their holidays，but they stayed with her for only two or three days. Luckily she had a cat with her. She liked it very much and took it everywhere she went.    One winter morning the old woman got up early. She was going to buy some food in a shop. And when she came out, she found there was much snow in the street. She had to sweep it away. And suddenly she found the cat at the corner of the house. And then she laughed .Her cat caught a big mouse.

第六次人口普查数据显示，我国人口总数已经突破（ ）

常温下，把pH＝11的NaOH溶液与pH＝3的醋酸溶液等体积混合，在所得溶液中离子浓度大小关系正确的是（  ）