题目

在自然生态系统中，能量流动和物质循环的关系叙述不正确的是(  )                                          A．能量流动和物质循环是生态系统的主要功能     B．能量是推动物质循环的动力     C.能量只能在食物链中流动       D．能量的固定、储存、转移和释放，离不开物质的合成和分解等过程     阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。 Monty Roberts, owner of a horse ranch (牧场) in San Ysidro, once told us a story. “When a young man was a senior, he was asked to write a paper about what he wanted to   1and do when he grew up. In his seven-page paper he described his   2of someday owning a horse ranch. He drew a   3floor plan for a 4,000-square-foot house that would   4on a 200-acre dream ranch. Two days later he received his   5back. On the front page was a   6red F. The teacher said, ‘This is an   7dream for a young boy like you. You have no money. Owning a horse ranch requires a lot of money.’ Then the teacher   8, ‘If you will rewrite this paper with a more realistic goal, I will reconsider your   9.’ The boy asked his father what he should do. His father said, ‘Look, son, you have to make up your own   10on this. However, I think it is a very  11decision for you.’   12, after a week, the boy   13the same paper, making no   14at all. He stated, ‘You can keep the F and I’ll keep my   15.’ Monty then turned to us and said, “I tell you this story   16you are sitting in my 4,000-square-foot house in the middle of my 200-acre horse ranch. I still have that school paper framed (装框) over the fireplace.” He added, “The best part of the   17is that two summers ago that same schoolteacher brought 30 kids to camp out on my ranch for a week. When the teacher was leaving, he said, ‘Look, Monty, I can tell you this now. When I was your teacher, I was   18of a dream stealer. During those years I stole a lot of kids’ dreams.   19you had enough determination not to give up on yours.” Don’t let anyone   20your dreams. Follow your heart, no matter what. 1.A. be                B. find            C. learn           D. see 2.A. reason            B. goal            C. purpose         D. way 3.A. rough             B. new             C. secret          D. detailed 4.A. live              B. locate          C. sit             D. run 5.A. mark              B. paper           C. plan            D. idea 6.A. large             B. tiny            C. beautiful       D. long    7.A. old               B. imaginative     C. impractical     D. interesting 8.A. shouted           B. smiled          C. replied         D. added 9.A. grade             B. need            C. honesty         D. ability 10.A. time             B. energy          C. mind            D. money 11.A. urgent           B. quick           C. important       D. good 12.A. Actually         B. Finally         C. Gradually       D. Usually 13.A. turned down      B. turned around   C. turned to       D. turned in 14.A. comments         B. changes         C. judgment        D. answer 15.A. dream            B. courage         C. interest        D. spirit    16.A. though           B. because         C. until           D. if 17.A. incident         B. event           C. story           D. lesson 18.A. anything         B. nothing         C. everything      D. something    19.A. Fortunately      B. Strangely       C. Curiously       D. Probably    20.A. forget           B. steal           C. know            D. realize