【单选题】They ______ from humanities and toward hard skills.
【单选题】We have many cases where hard work as well as good communication skills have _____ one's chances of success in the past years. [ ]
【简答题】most, hard work, skills, can, be improved, with
【单选题】给定消费c=40+0.8y,净税收t=20,投资i=70-400r,净税收增加10单位使IS曲线( )。