We are busy ______ our lessons these days.
A. prepare
B. preparing
C. to prepare
This room is ours, and that one is ______.
A. them
B. their
C. theirs
The woman's daughter is ______.
A. four years old
B. eight years old
C. nine years old
某公司的财务杠杆系数为1.25,经营杠杆系数为1.6,则该公司的销售额每增长10%就会造成每股收益增长( )。
A. 18.5%
B. 16%
C. 20%
D. 3.5%