题目

Fill in each blank with a proper word chosen from the box.Each word can be used only once. Note that there is one word more than youneed. A. declineB. invested C. scratchingD. harvestE. farmersF. barely G. occurrenceH. implementationI. unmarketableJ. adjustmentsK. enemies Like many people acting on the desire to eat healthy andlocal, Acropolis resident Eduardo Jimenez decided to plant a garden in hisbackyard. He ploughed the soil, he planted the seeds, and he even set up afence to keep out the deer. Eduardo did everything right. Or so it seems.However, when time has come, he has not已知1a+1b=1a+b，则ba+ab的值为（　　）A．1B．0C．-1D．-2