【题目】A large part of human activity, particularly in relation to the environment, is ______ conditions or events.
A.in response to
B.in favor of
C.in honor of
D.in need of

【答案】A
【解析】A. in response to对……的回应（反应）；B. in favor of赞成，支持；C. in honor of向……表示敬意；D. in need of需要；句意：人类的大部分活动，尤其是与环境相关的活动，是对周围条件或事物所反应的现象。根据句意，故选A。