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问题 选择题

决定DNA遗传特异性的是[ ]

A．脱氧核苷酸链上磷酸和脱氧核糖的排列特点

B．嘌呤总数与嘧啶总数的比值

C．碱基互补配对的原则

D．碱基排列顺序

答案

答案：D

完形填空
完形填空。
Dear Editor,
    I am a reader of your magazine and I need help. I am very    1   these days because I have some
problems with my new school.
    I am a Grade 8 student. I just moved to Beijing with my parents two months ago. Now, I am    2   
at a new secondary school in Sunshine Town. It is bigger than my old school. I do not know the new
school very well   3   I have no friends here.
    I do not know    4   to talk to my new classmates.    5  , I am very nervous and I cannot answer
their questions. I feel really uncomfortable when they talk to me.    6   lunchtime, I always sit alone in
the playground and   7   books. I hope they will not    8   because I feel so shy when they try to talk
to me.
    I   9   my old classmates very much, but I really want to make friends with my new classmates. I
do not know what to do. I hope you   10  give me some advice.
                                                                                                                                       Cindy
(    )1. A. afraid        
(    )2. A. studying      
(    )3. A. so            
(    )4. A. what          
(    )5. A. Sometimes     
(    )6. A. After         
(    )7. A. watch         
(    )8. A. come back     
(    )9. A. miss         
(    )10. A. must           		B. sorry       
B. working      
B. and         
B. when        
B. Some time      
B. Before      
B. look        
B. come out    
B. forget      
B. can          		C. unhappy     
C. teaching      
C. but         
C. where       
C. Sometime       
C. During      
C. see          
C. come over    
C. remember    
C. need       		D. worried       
D. learning       
D. or           
D. how          
D. Some times                   
D. For          
D. read         
D. come on     
D. share         
D. should    
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单项选择题

治疗湿温时疫，湿热并重的首选方剂是（）。

A.藿香正气散

B.香薷饮

C.连朴饮

D.三仁汤

E.甘露消毒丹
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