太阳的东升西落、昼夜的交替，正确的解释是（ ）。
A：地球不动，太阳绕着地球转
B：太阳不动，地球围着太阳转
C：地球围着太阳公转的同时也自转
中国人是黄皮肤黑眼睛，欧洲人是白皮肤蓝眼睛，决定眼球颜色的结构是（ ）
—I think teenagers should be allowed to make their own decisions when they have problems at school.
—_______. They're not calm enough, after all.
