问题 填空题

如图为某细菌的结构示意图,请回答:

(1)将图中标号填入相应的横线上:______细胞壁,

______细胞膜,______细胞质,______核物质,______鞭毛.

(2)其中______在细菌的运动中起重要作用.

(3)与真菌的细胞相比,该细菌没有成形的______.

答案

图中各个数字所代表的结构为:A--鞭毛,B--荚膜,B--细胞壁,C--细胞膜,D--未成形的细胞核,E--细胞质.

细菌细胞的基本结构为:细胞壁、细胞膜、细胞质、未成形的细胞核;特殊结构有鞭毛和荚膜;

植物细胞的结构为:细胞壁、细胞膜、细胞质、细胞核、液泡、叶绿体;

动物细胞的结构为:细胞膜、细胞质、细胞核;

与动植物细胞相比,细菌特有的结构是[1]鞭毛,[2]荚膜,并且细菌都没有成形的细胞核.

故答案为:B、C、E、D、A、A、细胞核

完形填空
完形填空。
                                                    
    The hippopotamus, or hippo, lives in the hot part of Africa.   1   humans, dogs, and whales, it is a
mammal (哺乳动物). That is, its babies are   2   alive, and they drink milk from the mother's body. 
    The hippopotamus is a   3   grey animal with a big head and mouth. It   4   four tons, or about 4,000
kilograms. Its stomach is seven meters long, and it eats only plants. It is a mammal, but it   5   a lot of
time in the water.
     During the   6  , it sleeps beside a river or a lake. Sometimes it wakes up. Then it goes under the
water to get some   7   for food and never catches fish or hunts other animals. It can close its nose and
stay   8   water for ten minutes. Its ears, eyes, and nose are high up on its head. It can stay with its body
under the water and only its ears, eyes, and nose above the water. Then it can breathe the air.
    At night, the hippo walks on the nearby land and looks for food. It never goes very   9   the water.
    A baby hippo often stands on its mother's  10  -the part of the body between the neck and legs. The
mother looks for food underwater. The baby rides with a sure footing on her mother above the water.
( )1. A. With   
( )2. A. lives  
( )3. A. small     
( )4. A. reach   
( )5. A. spends   
( )6. A. day    
( )7. A. vegetables 
( )8. A. above    
( )9. A. far from  
( )10. A. stomach  
B. Unlike      
B. stayed        
B. large     
B. weighs      
B. takes        
B. week         
B. fishes      
B. on           
B. long enough   
B. back     
C. Such       
C. leave       
C. slim      
C. own         
C. costs      
C. month        
C. plants     
C. under        
C. close to   
C. mouth   
D. Like      
D. born         
D. weak         
D. runs         
D. pays         
D. season                          
D. insects     
D. beside        
D. near by    
D. head     
选择题