若一元二次方程ax2+bx+c=0,满足a-b+c=0,则方程必有一根为( )

题型:选择题

问题:

若一元二次方程ax2+bx+c=0,满足a-b+c=0,则方程必有一根为(  )

A.0

B.1

C.-1

D.±1

考点:一元二次方程的解法
题型:选择题

阅读理解

     It is common and usual to see people freak out when they face challenges in their life. We all pass in

different life problems and challenges. No one is free of life problems. Only a dead man faces no

problem. As long as you are alive, challenges are everywhere.

     How do you face problems and challenges in your life? Problems and challenges are the building

blocks of your personality. They make you who you are. Besides, whether what happened in your life

builds or destructs you depends on how you look at it. If you take your problems as troubles, they will

be troubles and may cause destruction. If you take them as constructive tools, you are going to be built

up on them.

     Problems are everywhere. No one can avoid them. And they are good too. They open up a different

look and opportunity if you are willing to see. When you face troubles, do not frustrate or freak out. Just

cool yourself to think in a different direction. Think in a positive way. Every problem has its own good as

well as bad sides. Focus on the good one. Look at the bright side.

     Besides, there is always a good person, perhaps your mom or dad, or one of your friends, right

beside you who can turn everything in to your best if you are willing to turn to them. No matter what

happens, they will be there to help you. Trust them and they will never let you down. All you need to

know is that you are loved wherever you are.

1. What's the meaning of the underlined phrase "freak out" in Paragraph 1 ?

A. Feel shy.    

B. Stay calm.  

C. Keep up.    

D. Feel upset.

2. In Paragraph 2, the writer implies that______

A. problems cause troubles  

B. attitude is everything

C. challenges can be avoided  

D. personalities are built on failures

3. According to the last paragraph, when we're in trouble, we _______.

A. can only depend on our parents      

B. are not alone

C. should only believe ourselves        

D. are not confident

4. What's the writer' purpose to write the passage?

A. To encourage.  

B. To compare.  

C. To prove.

D. To explain.

题型:选择题

下列哪项血清学检查对肝硬化的肝功能损害程度判断最有意义()

A.谷丙转氨酶

B.谷草转氨酶

C.碱性磷酸酶

D.单氨氧化酶

E.白蛋白/球蛋白比例

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克拉霉素与下列哪个药物作用相类似?()

A.阿米卡星

B.克林霉素

C.麦白霉素

D.多西环素

E.罗红霉素

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专门机关与广大群众的结合,是在双方目标一致基础上的结合,主导方面是( )。

A.广大群众
B.同级党委
C.同级人大
D.公安机关

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工程项目的设计概、预算是()和()的统称。

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