1．A troop of carefully selected soldiers set out in search of those who might ________ the terrible coal mine accident.
A．live B．rescue
C．exist D．survive
[解析]考查动词辨析。survive 幸存。句意：一支经过精心挑选的部队出发去寻找在可怕的煤矿事故中可能幸存下来的人。live 生活，居住；rescue 援救，营救；exist 存在，生存。
[答案]D
2．—Are you free after school?
—Sorry.I've planned to treat a friend of mine to dinner ________ for his help.
A．in addition B．in turn
C．in return D．in total
[解析]考查短语辨析。in return 作为(对……的)回报。treat a friend of mine to dinner in return for his help 意为“请我的一位朋友吃饭来回报他对我的帮助”。in addition 此外；in turn 轮流，又(对别人)做同样的事；in total 总共。
[答案]C
