3．A．Therefore，what economists try to do is to persuade people to reduce missed opportunities to save the cost．
B．For every hour we work at one job we could quite easily be doing another，or be sleeping or watching a film．
C．The biggest restriction on our resources is the number of hours we can devote to something，so we look to maximize the return we get on our investment of time．
D．We should weigh the choices of opportunities，learning to give up for better ones and obtaining what we want besides profits．
AB．For economists，every decision is made by knowledge of what one must forgo-in terms of money and enjoyment-in order to take it up．
AC．Yet，in a sense it's human nature to do precisely that-we assess the advantages and disadvantages of decisions all the time．
However wealthy we may be，we can never find enough hours in the day to do everything we want．Economics deals with this problem through the concept of opportunity cost，which simply refers to whether someone's time or money could be better spent on something else．
Every hour of our time has a value．（92）BEach of these options has a different opportunity cost-namely，what they cost us in missed opportunities．
Say you intend to watch a football match but the tickets are expensive and it will take you a couple of hours to get to and from the stadium．Why not，you might reason，watch the game from home and use the leftover money and time to have dinner with friends？This-the alternative use of your cash and time-is the opportunity cost．
（93）AB．By knowing precisely what you are receiving and what you are missing out on，you ought to be able to make better-informed，more reasonable decisions．Consider that most famous economic rule of all：there's no such thing as a free lunch．Even if someone offers to take you out to lunch for free，the time you will spend in the restaurant still costs you something in terms of forgone opportunities．
Some people find the idea of opportunity cost extremely discouraging：imagine spending your entire life calculating whether your time would be better spent elsewhere doing something more profitable or enjoyable．（94）AC．
In the business world，a popular phrase is"value for money．"People want their cash to go as far as possible．However，another is fast obtaining an advantage："value for time．"（95）C．By reading this passage you are giving over a bit of your time which could be spent doing other activities，such as sleeping and eating．In return，however，this passage will help you to think like an economist，closely considering the opportunity cost of each of your decisions．
分析 本文是一篇議論文．文章論述了不管我們多么的富有，在一天里我們不可能找到足夠的時間做我們想要做的一切．因此，我們要放棄一些事情選擇做更好的事情．
解答 92-95．B AB AC C
92．B 細節(jié)題．根據(jù)Each of these options has a different opportunity cost-namely，what they cost us in missed opportunities．這些選擇都有不同的機會成本，所以前面應(yīng)該提到了一些選擇，對應(yīng)了選項里的be sleeping or watching a film，故選B．
93．AB 概括題．根據(jù)本段的例子Even if someone offers to take you out to lunch for free，the time you will spend in the restaurant still costs you something in terms of forgone opportunities．可知，如果一個人帶你出去吃飯，那么你在餐館的時間會讓你放棄一些其他機會，所以你做出的一個決定意味著你要放棄另外的，不管是錢還是時間，故選AB．
94．AC 細節(jié)題．本段的大意是花時間來計算機會成本是一件得不償失的事情，而且考慮這些優(yōu)點和缺點是人的一種天性，故選AC．
95．C 細節(jié)題．最后一段提到了付出的時間和收獲之間的關(guān)系，對應(yīng)了選項里的 look to maximize the return we get on our investment of time．即時間的投入讓我們獲得的最大的回報．
點評 本文是一篇選句填空閱讀，題目主要考查上下文內(nèi)容聯(lián)系以及文章內(nèi)容理解．做題時學(xué)生應(yīng)仔細閱讀原文，把握文章主要內(nèi)容，聯(lián)系文章上下文內(nèi)容并結(jié)合所給選項含義，從中選出正確答案，一定要做到有理有據(jù)，切忌胡亂猜測．
