【单选题】That she hadn’t kept her ____ on her work resulted in the failure.
【单选题】What does the woman say about her business?
A.
Most of her work is with one company.
B.
Work needs to be delivered every month.
C.
Contracts take a long time to negotiate.
D.
Negotiating fees is a standard practice.
【单选题】She ________ on her work so much that she didn’t notice that a crowd of people had _______around her.
C.
concentrated; concentrated
【判断题】马尔萨斯1798年《人口原理》认为,人口呈几何级数增长,生活资料呈算数级数增长,为了避免饥荒、战争、瘟疫等成为解决人口和粮食矛盾的方式,必须节制人口。