题目

7．Schools across China are expected to hire 50,000 college graduates this year as short-term teachers __________increase job opportunities.        A．help  B．to have helped  C．to help      D．having helped 答案：C下列渔场是由冷海水上升形成的是（　　）A．纽芬兰渔场B．北海道渔场C．秘鲁渔场D．北海渔场