5.brazil is the largest soybean producer and the third maize producer in the world, contributing with 30% and 7%, ( ), of the global harvest of these crops in 2013.

　　a. exclusively

　　b. incredibly

　　c. respectively

　　d. undoubtedly

　　【答案】c。句意为：巴西是世界上最大的大豆生产国和第三大玉米生产国，分别占2013年这些作物全球收成的30%和7%。a.唯一地，b.难以置信地，c.分别地，d.无疑地 所以答案选c。