A:hoping
B:to hope
C:hoped
D:being hoped
——I hear you______ in a sports center. What's it like?——Well, it's very hard work and I'm always tired, but I don't mind.
下列变化是化学变化的是____
A.冰雪融化 B.钢铁锈蚀 C.玻璃破碎 D.____
代表南极地区和北极地区的典型动物分别是( )。