企业纳税年度发生的亏损，准予向以后年度结转，用以后年度的所得弥补，但结转年限最长不得超过( )年。

A．1

B．3

C．5

D．7

In a certain group of people, the average (arithmetic mean) weight of the males is 180 pounds and of the females, 120 pounds. What is the average weight of the people in the group ？（）
(1)The group contains twice as many females as males.
(2)The group contains 10 more females than males.

A．条件(1)充分，但条件(2)不充分．

B．条件(2)充分，但条件(1)不充分．

C．条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．

D．条件(1)充分，条件(2)也充分．

E．条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．