以下关于斑秃的描述正确的有()
A.突然发生
B.有自愈倾向
C.不累及眉毛、睫毛和毳毛
D.秃发区皮肤正常
参考答案:A, B, D
太阳的半径约为696 000千米,用科学记数法表示数696 000为______.
Before the storm,fishes in the pond usually________themselves out of the water to get fresh air. [ ]
A. throw
B. run
C. swim
D. escape