根据生产函数三阶段理论，总产量最大的条件是（）
A、APP=0
B、APP=MPP>0
C、MPP=0，APP>0
D、MPP>APP
参考答案：C
She knows how to make full use of her time and her parents never put________on her to work hard. [ ]
A. force
B. pressure
C. burden
D. weight
世界上最古老的海是（）
