下列哪项不是暑温常见四证？（）
A.昏迷
B.高热
C.抽风
D.痰鸣
E.头痛
参考答案：E
—I often go _______ with my mom.
—Oh, you may buy a lot of things you need. [ ]
A. fishing
B. shopping
C. skating
试述放射性核素的有关概念。
