未完成房地产经纪服务合同约定的事项，或者服务达到房地产经纪服务合同约定标准的，房地产经纪机构（）。

A．不得收取佣金

B．可酌情收取佣金

C．可根据完成情况按比例收取佣金

D．可与委托人协商确定是否收取佣金

• (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．

Automobile A is traveling at two-thirds the speed that Automobile B is traveling. How fast is Automobile A traveling
(1) If both automobiles increased their speed by 10 miles per hour, Automobile A would be traveling at three-quarters the speed that Automobile B would be traveling.
(2) If both automobiles decreased their speed by 10 miles per hour, Automobile A would be traveling at half the speed that Automobile B would be traveling.