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
答案：B
土地
He went fishing after he finished ______ his homework.[ ]
A. do
B. does
C. to do
D. doing
