儿童钩端螺旋体病主要发生于（）
A.新生儿
B.婴儿
C.幼儿
D.学龄前期儿童
E.学龄儿童
参考答案：E
数据0.000207用科学记数法表示为（ ）
A．2.07×10-3
B．2.07×10-4
C．2.07×10-5
D．2.07×10-6
I think the Rockets is the strongest team and there is _______ that it will win the competition.
A．no chance
B．no way
C．no doubt
D．no wonder
