人类活动最主要的能量来源是太阳辐射。（    ）

太平洋服装超市某种服装的标价为120元，元旦期间以九折降价出售，仍获利20%，该服装的进货价为（    ）

   John is my best friend. We live in the same building. We study in the same school but not in the same class. We often play football together after school. We have been good friends for two years.
   John is tall and strong with black hair. He has a round face, a small nose and big, brown eyes. I like his eyes because they are always bright and smiling.
   John is always friendly and helpful. When I feel bored or unhappy, he tells me funny jokes and makes me laugh. He'll give me help when I need.
   John is very smart. He reads a lot of books. He is good at singing and acts very well. He would like to make people happy with his songs and performance when he grows up. I believe that he can become as popular as Jackie Chan and travel around the world in the future.

下图是a、b、c三种物质的溶解度曲线，下列说法正确的是(       )

东东喜欢看韩剧《来自星星的你》，“都教授”──金秀贤成为东东心目中的青春偶像。对待如韩剧一样的外来文化，我们的正确态度是（    ）