问题
选择题
下列各项中，不能称为生态系统的是（ ）
A．太平洋
B．梅江河
C．上官塘水库
D．一群羊
答案
由分析可知A、B、C都是既包括了生物生存的环境，又包括了环境中所有的生物，因此都是由生物与环境构成的一个生态系统．故A、B、C错．
D、一群羊：只有动物，没有植物、细菌真菌等生物，也没有环境，不符合生态系统的概念，因此不是生态系统．故D正确．
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下列各项中，不能称为生态系统的是（ ）
A．太平洋
B．梅江河
C．上官塘水库
D．一群羊
由分析可知A、B、C都是既包括了生物生存的环境，又包括了环境中所有的生物，因此都是由生物与环境构成的一个生态系统．故A、B、C错．
D、一群羊：只有动物，没有植物、细菌真菌等生物，也没有环境，不符合生态系统的概念，因此不是生态系统．故D正确．
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| Where is the bus? Why is it always late?" I asked myself. I was going to be late, 1 the manager wasn't going to be pleased."Thank God, here it is!" The bus came round the corner and I got on. Ten minutes later I was walking into the 2 where I work.."Twenty-five past nine. I 3 the manager doesn't notice." But I was not 4 . "Smith!" shouted the manager."Late again. What's your 5 this time?" "I am afraid the bus was late, Mr. Brown."" 6 up earlier tomorrow! Anyway, go to your place at the counter (柜台). We'll be opening in a few minutes." My first customer was a pretty girl wearing a red dress. 7 her was a young man of about 25. He seemed very 8 , and every few seconds he looked towards the main entrance. The girl drew (提取) some money and 9 about opening an account. I gave her necessary 10 and she went out. 11 , I noticed a tall man by the door, carrying something 12 with brown paper. Turning to my next customer, I was frightened to see a gun sticking out of his coat. The next moment a loud noise 13 my ears. Everything went black. I was falling… It seemed to be a long time 14 I opened my eyes and I found myself in bed! 15 shaking from the memory of this terrible dream, I got dressed and ran out of the house. 16 , the bus wasn't on time, and I got to the bank at 9:25. "Smith!" the manager cried out in a voice like thunder." 17 of your excuses! Start work at once!" To my 18 , the first customer was a girl 19 a red dress and behind her stood a man carrying something wrapped n brown paper. The 20 ! Sometimes life is full of coincidences (巧合)! | ||||
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