青蛙既不能完全在水中生活，又不能完全在陆地生活的原因是[ ] A．青蛙体表无覆盖
题型：选择题
问题：
青蛙既不能完全在水中生活，又不能完全在陆地生活的原因是[ ]
A．青蛙体表无覆盖物，失水较快
B．在水中和陆地都没有足够的食物
C．身体散热快，不能长时间留在水中
D．青蛙呼吸依赖肺和皮肤两种器官
题型：选择题
补全对话
A : Hi, Lucy! 1
B: Oh, I' ve been to many places with my parents, such as Hangzhou, Beijing and Xi'an.
A: 2
B: Really? What places have you been to,Sarah?
A: Very few. I've only been to Zhouzhuang.
B: 3
A: It's in Suzhou. It's a small place. It's the No. 1 Water Country of China. There you can see many old buildings on the water, because Zhouzhuang has a long history.
B: 4 I've just seen a lot of natural beauties, but not much old China culture yet.
A: 5
