用方框中所给的词语的适当形势填空，使短文正确、通顺、连贯（每词限用一次）

Yesterday I visited the Hong Shan Forest Zoo. I was____ to find few people there. ____ are very important places. They provide homes____ many endangered animals .They also help to educate the public about
____ them . If we ____ our zoos, they won’t have enough money to take care of so____  fine animals. Therefore, People should go and visit the zoos more often to learn about animals and help to protect them ____ .
However, some people don’t think so. They think zoos are terrible places for animals to live.“I’ve visited a lot of zoos in my life, and I have never seen one I like or one that____ animals to live in .”Jenny said The animals____ in small cages and can ____ move at all .What’s more, they are only given food once a week That’s terrible.

分子是构成物质的一种粒子，下列有关水分子的叙述正确的是（　　）

如图所示，光滑轨道的半径为2 m，C点为圆心正下方的点，A、B两点与C点相距分别为6 cm与2 cm，a、b两小球分别从A、B两点由静止同时释放，则两小球相碰的位置是(　　)