单项选择题 Mike`s parents expected him to go on studying after hegraduated from college, but he won`t listen to them because he ______ to workin a bid computer company in Shanghai. A. decided B. wasdeciding C. hasdecided D. will decide

单项选择题 4.如果用a表示本世纪初中国的人口数量，用b表示中国的人口合理容量，用c表示中国的环境承载力，那么a、b、c三者的大小关系是 A.a<b<c B.c<b<a C.b<a<c D.a<c<b

多项选择题 查勘员需要具有哪些素养？（）