如果一个几何体的三视图如图所示，主视图与左视图是边长为2的正三角形、俯视图轮廓为正方形，（单位长度：cm），则此几何体的侧面积是（　　）

美国是高度发达的资本主义国家，下列关于美国经济的叙述正确的是（  ）

A

    Tom is an eight-year-old student in Grade three. He is not interested in his lessons. He spends most of his time playing basketball. At night, he doesn't sleep until very late in order to play. In the morning, he usually gets up late and hurries to school. Sometimes he sleeps in class.

    Tom's father is worried about his poor schoolwork. He tried to make him work harder. One day, his father said to him, "My boy, if you get one hundred marks in the exam,  I'll buy a new basketball for you." The boy was very happy to hear that.

    The next day  Tom came running home. "Oh, Dad, I got one hundred." He shouted, "I got forty in English this morning and sixty in Chinese this afternoon!"

根据短文内容判断正误。