|
49.Whether you live to eat or eat to live, food is a major _______ in every familys budget. A.nutrition B.expenditure 花费 费用 C.routine 例行公事 常规 D.provision 供应量 50.Now a paper in Science argues that organic chemicals in the rock come mostly from __________ on earth rather than bacteria on Mars A.configuration 结构 分布形状 B.constitution 宪法 事物的一般结构 C.condemnation 批评 责难 D.contamination 化学污染 放射性污染 51.There is much I enjoy about the changing seasons, but my favorite time is the ________ from fall to winter. A.transmission B.transformation 转变 C.transition D.transfer | 
