题目

旅游公司在景区内配置了50辆观光车供游客租赁使用，假定每辆观光车一天内最多只能出租一次，且每辆车的日租金x(元)是5的倍数．发现每天的营运规律如下：当x不超过100元时，观光车能全部租出；当x超过100元时，每辆车的日租金每增加5元，租出去的观光车就会减少1辆．已知所有观光车每天的管理费是1100元． (1)优惠活动期间，为使观光车全部租出且每天的净收入为正，则每辆车的日租金至少应为多少元？(注：净收入＝租车收入－管理费) (2)当每辆The three youths leaned over the metal rails along the sea-wall and watched a few fishermen pull in their nets. About thirty metres away, a boat pulled alongside the slippery steps leading 36_____ to the sea. “Hey, look!” exclaimed Rahim. “Those two men are 37_____ heavy rocks. I thought we no longer do muscle labour in this technological 38_____. ” “You don’t 39_____ a crane (起重机) to unload less than a dozen rocks, do you?” smiled Joshua. “But those men don’t 40_____ to have muscles at all,” said Michael, rather surprised. Joshua smiled. “They are 41_____ laborers who know how to spread the weight of the rocks they 42_____. See how the man positions the rock just at the slope of his  43  . Some of the rock’s weight is set 44_____ his head, some on the right hand and some on the left hand. His body isn’t bent. His legs are well 45_____ .” “You’re right, Josh. He may have a small build. 46_____ he certainly well knows his job. Dear me! And to think we have been studying 47_____! ” Rahim thought about all that was happening. Suddenly, he said, “Technology won’t 48_____ the human being completely, it appears.” “I don’t think it will. ” 49_____ Joshua. “You can harvest a crop of potatoes or wheat with one of those large, multi-purpose tractors, but you 50_____ use that equipment to harvest tea leaves and tomatoes, will you?” “You can get a computer to 51_____ multiple-choice assessments, but you cannot get the computer to produce of assess essays, can you?” asked Michael. “Well, the washing machine leaves my shirt collar quite as 52_____ as ever --- that’s domestic technology for you! ” said Rahim. “One day, perhaps, there won’t be anybody 53______ who can carry a large rock the way those men do. It’s not going to be a very 54______ world, I’m afraid.” Sighed Michael. “You’re too much of a pessimist (悲观主义者)，Mike.” Said Joshua. “ 55_____ will always be other things that will make the world exciting. ” A. through               B. across           C. down             D. up A. loading               B. unloading        C. covering          D. uncovering A. way                  B. revolution       C. process            D. era A. ask                   B. expect          C. attempt            D. hope A. happen                B. fail            C. have              D. seem A. ambitious             B. experienced      C. potential         D. energetic A. take                 B. fetch             C. carry             D. bring A. shoulder              B. back             C. chest            D. arms A. on                   B. against                  C. toward          D. under A. supported              B. grasped           C. placed            D. strengthened A. but               B. however          C. so                D. therefore A. chemistry          B. physics           C. biology           D. psychology A. control             B. affect           C. remove            D. replace A. agreed             B. proposed         C. refused           D. denied A. can’t               B. mustn’t         C. won’t             D. needn’t A. point out            B. take out          C. hand out         D. print out A. dirty               B. clean           C. old                     D. new A. caught              B. arranged         C. left             D. convinced A. exciting             B. mysterious      C. technological    D. modern A. That                B. This           C. They            D. There