182.[答案]C. at random.[详解]at random(=without aim or purpose)随便地，胡乱地：His clothes were scattered about the room at random. By accident意外地;on occasion偶尔;on an average平均计算。

181.[答案]A. purpose.

　[详解]on purpose是介词习语，意为“故意地”。如用intention,则应说by intention故意地。

180.[答案]A. recall.[详解]recall(=bring back to the mind)想起，回忆起：But I really cann't recall your name at his moment.

　Remind sb. of ...使......想起：1)The photo reminds me of my late father.(这张照片使我想起已故的父亲。) 2)The sight of the clock reminded me that I was late.Remind sb. to sth.提醒......做......;Please remind me to write the letter.

179.[答案]D. realised.[详解]realise sth. by doing sth. else通过做......来实现.......。

178.[答案]D. policy.[详解]policy(尤指政党、政府、大企业、商行等的)政策，方针。Campaign(政治或竞选的)运动;(军事的)行动，procedure做事的手续、程序，rule规则，plan计划，均不合题意。

　本题译文：本公司的一贯方针是鼓励工人参加社会活动。

177.[答案]D. point.[详解]point(=chief idea of sth. said, done, or planned)要点;论点，主旨：I don't see your point.(我不明白你的意思。)He said nothing to the point.(他说的不切题。)

176.[答案]C. occasion

　[详解] occasion 作可数名词时，意为“时机”，作不可数名词时，意为“必要”，本题中occasion意为“必要”。从句语法结构上看，本句中用opportunity(难得的)机会，chance(偶然的)机会均可，但按逻辑意思，应用occasion.

175.[答案]C. notify.[详解]notify通知。Notice n.通知;v.注意到;note n.笔记;v.记下，摘下。

174. [答案]B. natural.[详解]natural自然的，与后半句“许多人认为它们是真的”相呼应。

173.[答案]C. fall back on.[详解]fall back on求助于。参阅Ⅲ.48注释。

　Fall short of没达到，低于：1)He fell short of what we had expected.(他没有达到我们的期望。) 2)The measures proposed fall far short of what is required.(所提出的这些措施远没达到需要的 目标。)Fall in with与......一致，符合;同意，赞成，支持。Fall through落空。参阅Ⅲ.49注释。

　本题译文：母亲在医院就医的各种帐单送来时，父亲高兴的是他可用银行里的存款来支付。