图中，大圆和小圆分别表示地球赤道、极圈，箭头表示地球自转方向，阴影部分表示夜半球．其中，表示泰安冬季的图是（ ）
A：
B：
C：
D：
— Mr. Li will check our homework this afternoon. _______ you _______ it?
— Not yet. I'm doing it right now.
____ you ____ your brother can join us. We want one of you.
—Sure it is! The government ________ have made great efforts!
