使锋面向冷空气一侧倾斜的主要原因是（）。
A．气压梯度力作用
B．地球自转运动的作用
C．水平方向的空气流动
D．冷暖气团相互抬挤
参考答案：B
阅读下列短文，列出一个时间表。
Today is Sunday. I get up at 6:30. Then I have breakfast at 7:30. At 8:00, I play basketball with my friends.
I go shopping at 10:00. And I have lunch at 12:30. Then I have a rest. In the afternoon, I do my homework. In
the evening, I watch TV with my grandparents. At about 9:30. I go to bed. This is my Sunday.
慢性肺心病最常见的心律失常是
A．房性早搏和室上性心动过速
B．心房纤颤
C．心房扑动
D．室性心动过速
E．室性早搏
