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问题 单项选择题 A1/A2型题

伊红、酸性复红都是酸性染料，其离子带负电荷，而细菌与之结合的带正电荷的部分是（）

A.脂质

B.多糖

C.核酸

D.氨基酸

E.原生质中矿物质

答案

参考答案：D

解析：伊红、酸性复红为酸性染料，其离子带负电荷，而细菌的氨基酸带有正电荷，可与其结合，使菌体红染。

阅读理解
阅读理解。
Family member
What does he/she look like?
My father
My father is very tall. He has curly hair. He's handsome
My mother
My mother is not beautiful. She is short. She is only 1.5
metres. She has black hair. And she is fat.
My sister
My sister is a lovely girl. She has long curly hair. She's of
medium build.
My brother
My brother looks like my mother. He is short, too. He is
heavy.
1. What does the writer's father look like? 
A. He is very short.    
B. He is short and has black hair.    
C. He's of medium build.    
D. He is tall and has curly hair.
2. Who are short and heavy?
A. The writer's mother and brother.    
B. The writer's mother and father.    
C. The writer's father and sister.    
D. The writer's father and brother.
3. Does his brother look like his father?
A. Yes, he does.                
B. No, he doesn't.    
C. Yes, he doesn't.              
D. No, he does.
4. What does the writer look like?
A. He is handsome.    
B. He is heavy and tall.    
C. He has long curly hair.    
D. We don't know.
5. According to the passage, which is RIGHT?
A. There are four people in the writer's family.    
B. The writer's mother is a beautiful woman.    
C. The writer's father and sister have curly hair.    
D. The writer's brother looks like his sister.
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不定项选择题

小王是家里的独生子，平时爸爸、妈妈对他非常宠爱，在家里几乎是说一不二。家庭环境的影响，使他不太关心集体，待人骄傲、自负，喜欢对同学们发号施令，因此大家都疏远了他。小王因此很孤独、很苦恼。小王要获得同学们的友谊，正确的做法是 [ ]

A．认定几个同学和他们交往，即使对方拒绝也无所谓

B．积极参加集体活动，关心集体事务

C．真诚待人，尊重同学，不说伤同学自尊的话

D．在学习、生活等方面主动帮助有困难的同学

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