The tribe has agreed to contribute 2 percent of net （）to charitable activities in the county.

单项选择题His （）with computers began six months ago.

A．imagination
B．innovation
C．observation
D．obsession

单项选择题According to the new tax law, any money earned over that level is taxed at the （）of 59 percent.

A．ratio
B．percentage
C．proportion
D．rate