Last week our class went to the zoo as part of our science project. We spent a few hours1there. We didn't do much studying. We just had a good 2 . We left for the zoo by bus at 9:00 and 3 at the zoo half an hour later. There are all kinds of 4 in the zoo. And the animals have many good 5 for us. We all wanted to watch the elephant show at 10:00. But before that we went to look at snakes because it was a part of our project. I don't like snakes because they are so 6. The elephant show lasted 45 minutes. It was really nice. I didn't know elephants can play soccer so 7! Then we had a 15-minute break for a drink, we went 8  the zoo trying to see as many animals as we could before 9. Lunch was fun because we had it 10 monkeys. We went back on the bus at 2:00. It took 30 minutes to get back to school.

下列关于资源、能源、环保方面的叙述正确的是（　　）

（1）Swallows fly back to the ____ part of the country in winter every year.(南方)
（2）The space sleeping bag is fixed to the walls to prevent ____ .（飘浮）
（3）I am not sure whether the watches are those ____ .(绅士）
（4）You will get much____ if you give up eating fast food.(苗条)
（5）It is said that this kind of the car is____ designed for her.(特别的)
（6）In winter you’d better keep____  warm enough to stay healthy.(you)
（7）We____  could not believe our ears when we heard the surprising news.(simple)
（8）The water in the river is ____ . You can drink it without cooking.(harm)
（9）Works of MoYan is very popular among Chinese____  .(read)
（10）My daughter hopes to go abroad for ____ (far) study next year.

如图表示正常人肾小管内，某种物质含量变化，该物质是（    ）