在正常情况下，树木地上部分与地下部分间为一种（）的关系。
A、相互促进
B、相互矛盾
C、制约
D、协调
参考答案：A, D
The Olympic Games, in 776BC, did not include women players until 1912.
A. first played B to be first played C first playing D to be first playing
财务内部收益率是反映项目( )常用的动态评价指标，可通过财务现金流量表计算。
A．运营能力B．盈利能力C．风险大小D．偿债能力
