【单选题】Early in his life, he learned to treasure the work of other people he helped his father do the farming. [ ]
【单选题】关于某消费者的无差异曲线的下列陈述中,一般来讲,不正确的是( )。(电子科技大学2010研)
C.
“多多益善”假设暗示:越靠近原点的无差异曲线代表着更高的效用水平
D.
无差异曲线的斜率实际上代表了该消费者在不同商品之间替代意愿
【单选题】My friend helped me unpack at the hotel and then went back to work.
【单选题】反竞争性抑制作用的叙述作用的叙述正确的是
【单选题】With his mother_______ him, he is getting on well with his work.
【单选题】Having no one else _____ him with the work, he had to put it off till later.