题目

中国是一个农业大国，粮食生产关系到国计民生。阅读下列材料，回答相关问题： 材料一 1949年到1960年粮食产量变化图 材料二 到粉碎四人帮以后的1977年，人均口粮还没有达到1957年的水平。全 国有1.5亿农村人口的口粮不足。材料三读上图：1954年，政务院发布了《关于实行粮食计划收购和计划供应的命令》，自1955年开始我国粮食部首次发行全国粮票，国家对粮食及粮食制品定人定量、计划供应。90年代初，使用了近40年的粮票终于结束了它的特殊身根据短文内容，从短文后的选项中选出能填入空白处的最佳选项．选项中有两项为多余选项． Well—done on an Exam     Do not underestimate the power of revision in the days and hours before an examination．The closer you are to the exam，the more chance you have of storing and attaining key information．But do not overdo it．  1  An effective daily routine can help you through an exam period，so in the days leading tip to your first exam，get into the habit of being up and ready to work．It can be a shock to the system after months of working to your own timetable to be mentally alert at that time if you have not prepared for it． On the day of the exam，have a good breakfast，pack everything you need（pens，pencils，erasers，etc），then make your way to the examination hall in good time．  2    Once in your seat，simply pause for a few seconds and collect your thoughts．Close your eyes and take in a few slow，deep breaths to help you relax．When you turn over the test paper，spend a short period reading through all t he instructions and questions，paying particular attention to key verbs such as“discuss”，“compare”and“evaluate”．  3  It is always wise to allow 10 minutes at the end of the exam to give yourself time to go back over your answers．Once you have selected the questions you wish to tackle，begin by attempting the one you think is your strongest．It will give you more confidence when you see a well-answered quest ion down on paper．Also remember to write clearly，and do not be afraid to express the unexpected：after all，examiners can get very bored marking stereotypical（模式化的）answers．     4  If you need something else to focus on to help you collect your thoughts．Choose a fixture in the room，such as the ceiling or anything else that will not allow you to be  distracted．     Finally，once you have finished，never hang around outside afterwards to attend the discussion by other students．  5      A．Try not to look at those around you，or at the clock．     B．When you get home，read the examination paper through and look up the other words you didn’t understand．     C．Sleep，exercise and relaxation are all just as important．     D．Map out a quick plan of points you wish to make and how much time you should spend on each question．     E．Go and have a well—earned rest——then prepare the next exam．     F．Do not arrive too early，though，as other people’s anxiety can be contagious（传染性的），and you may suffer from undue panic．     G．If possible，you can arrive early and communicate with those worried students and help them overcome their anxiety．