单选题
These pollutants can be ______ hundreds and eve thousands of kilometers by large air masses.
A. contained B. conveyed C. contaminated D. conserved
【正确答案】
B
【答案解析】这些污染物可以被大风带走上百甚至上千公里。convey“运载，传送”，恰好符合句意；contain包含，含有；contaminate使……受污染；conserve使……不变质、不受损或保护。