A worker is most likely to earn economic rent when the marginal revenue product (MRP) from her labor and the supply curve for her type of labor exhibit which of the following characteristics MRP Supply curve（）①A. High More elastic ②B. LowLess elastic ③C. High Less elastic

A. ①

B. ②

C. ③

是非题：

（1）松的球果不是果实。                                                  （    ）

（2）植物对维持生物圈中氧气和二氧化碳的平衡起重要作用的生理活动是光合作用。（    ）

（3）消化系统中所有器官都与事物接触。                                    （    ）

（4）受精卵在还没有到达子宫前就已经分裂了。                              （    ）