地球绕地轴旋转，从北极上空俯视呈（）方向旋转。
参考答案：反时针
—_______.
—It's a key. [ ]
A. What's this?
B. What color is it?
C. Spell it.
D. How are you?
阅读胸片
首先考虑的疾病是（）
A.肺癌
B.肺结核
C.肺炎
D.肺脓肿
E.胸膜炎
