问题 解答题

识图回答

(1)如如图是一个______系统.

(2)如图中“→”表示______,即各种生物之间的______与______的关系.共有______条.

(3)如图中生产者______.食草昆虫、食虫鸟以及青蛙等都是______.

(4)该系统中能量的最终来源是______.

答案

(1)、生态系统可以分为森林生态系统、草原生态系统、海洋生态系统、淡水生态系统、湿地生态系统、农田生态系统和城市生态系统等,该图中,有草和生活在草原上的各种动物,和细菌、真菌以及非生物部分如阳光、空气、水等组成了草原生态系统.

(2)、在一个生态系统中,生产者和消费者之间存在一种吃与被吃的关系,起点是生产者,终点是消费者,表示食物链,(表示方法:生产者→消费者). ①草→鼠→猫头鹰②草→鼠→蛇→猫头鹰③草→食草昆虫→食虫鸟→猫头鹰④草→食草昆虫→蜘蛛→食虫鸟→猫头鹰⑤草→食草昆虫→蜘蛛→青蛙→蛇→猫头鹰⑥草→食草昆虫→青蛙→蛇→猫头鹰.

(3)、在一个生态系统中,有生物部分和非生物部分,而生物部分包括生产者、消费者、分解者,图中草是生产者,而鼠、食虫鸟、食草昆虫、蜘蛛、青蛙、蛇和鹰是动物属于消费者.

(4)生物圈中所有生物的能量来源是太阳,绿色植物进行光合作用,制造有机物,把光能转化成储存在有机物里面的化学能,植物制造的有机物除满足自身的需要外,还是其他生物的能量和食物来源.

故答案为:(1)草原生态 (2)捕食关系;吃;被吃;6 (3)草;消费者 (4)太阳能

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完形填空。
      It was seven thirty. Supper was    1    an hour ago, but Tom still wasn't    2    .
Mrs Brown was worried. She went to the door and     3   . Half an hour later, Tom
got home. When he saw his mother, he said, "I'm very, very     4    ."
     After supper, Mrs Brown asked, "Why did you come back so     5   ,Tom?"
     "In class, some of my friends made a lot of noise (吵闹声)," answered Tom. "Our
teacher got     6   . After class he told us to do an exercise in the     7    ."
     "An exercise?" Mrs Brown said. "It was    8    , wasn't it?"
     "No, it was easy."
     "Why did it take so    9    to do it, then?"
     "We did our best to do it    10   ," answered Tom. "But we got different answers.
All the answers troubled (困扰) our teacher."
( )1. A. good  
( )2. A. away  
( )3. A. found 
( )4. A. hungry
( )5. A. late  
( )6. A. glad  
( )7. A. bedroom
( )8. A. easy  
( )9. A. long  
( )10. A. wrong
B. ready     
B. well     
B. thought   
B. sorry     
B. slow     
B. angry     
B. playhouse 
B. kind      
B. short     
B. right  
C. delicious    
C. back   
C. watched    
C. afraid      
C. fast       
C. nice   
C. classroom 
C. same       
C. light       
C. quickly
D. new       
D. down       
D. waited                                            
D. happy     
D. far      
D. ill       
D. playground 
D. hard       
D. heavy       
D. early  
单项选择题