1. The energetic ultraviolet radiation is ______ to life since it tends to break up the complicated molecules on which life depends. A. indissoluble B. indolent C. indiscreet D. inimical D 【句意】高能紫外辐射对生命是有害的，因为它倾向于分解生命赖以生存的复杂分子。 【解析】形容词词义辨析。indissoluble“不能分解的；不能溶解的；坚固的”；indolent“懒惰的；[医]无痛的”；indiscreet“轻率的；不慎重的”；inimical“敌意的；有害的”。由关键词“it tends to break up the complicated molecules on which life depends它易于分解生命所依赖的复杂分子”知“有害的”符合，由此知D项正确。 2. Eggs were on sale, and the shoppers______ the bargain. A. snatched up B. snapped up C. smashed up D. summoned up B 【句意】鸡蛋廉价出售，购物者们抢购该便宜货。 【解析】词组辨析。snatch up“夺取；抓起”；snap up“抢购”；smash up“撞毁；砸碎”；summon up“鼓起（勇气）；唤起”。由句中关键词“bargain便宜货”的对应知“抢购”符合语境，故B项正确。 3. If you can't give up smoking completely, at least try to ________. A. take down B. turn down C. cut down D. set down C 【句意】如果你不能完全戒烟，至少试着减少抽烟。 【解析】词组辨析。take down“（从高处）取下；拆除；记下”；turn down“拒绝；调低（音量或热度）”；cut down“减少；砍倒”；set down“制定；把……写下来”。由句中关键词“can't give up smoking completely不能完全戒烟”与“at least至少”的对应知“减少”符合语境，故C项正确。
