市场利基者的主要任务有二()、扩大利基市场、保护利基市场三项。
参考答案:创造利基市场
--The man in a black suit _______ be our youth worker.
--- I’m sure it _______ be him. I saw him in the laboratory building some minutes ago.
A.must; can’t
B.can; mustn’t
C.can; could
D.must; won’t
“读万卷书,行万里路”,这句话反映的教学原则是_____________。