已知两圆的半径R、r分别为方程x2-5x+6=0的两根,两圆的圆心距为1,两圆的

题型:选择题

问题:

已知两圆的半径R、r分别为方程x2-5x+6=0的两根,两圆的圆心距为1,两圆的位置关系是(  )

A.相交

B.外离

C.外切

D.内切

考点:一元二次方程的解法圆和圆的位置关系(圆和圆的相离,圆与圆的相交,圆与圆的相切)
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能与哺乳动物IgG结合的成分是 ()

A.SPA

B.BSA

C.PHA

D.LPS

E.HLA

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A few years ago, I had the opportunity to play the character of Ronald McDonald for the McDonald's Corporation.

One day each month,we visited hospitals bringing a little happiness to the children there. But there were two rules placed on me during a visit. First, I could not go anywhere in the hospital  without permission. And second, I could not physically touch anyone within the hospital. They did not want me to carry germs(细菌)from one patient to another. Breaking either of these rules, I was told, I could lose my job. One day, as I was heading down a hallway and on my way home, I heard a little voice coming through a half­opened door,“Ronald,Ronald.”

I stepped in and saw a boy,about five years old, lying in his dad's arms, Mom with a nurse on the other side. I knew by the feeling in the room that the situation was grave. I asked his name. He told me it was Billy and that I did a few simple magic tricks for him. As I stepped back to say good­bye, he asked me “Ronald, would you hold me?”

At such a simple request, my heart was screaming, “Yes!”But my mind was screaming louder. “No!You are going to lose your job!”

“Hold me” was such a simple request, and yet I searched for any reasonable excuses that allowed me to leave, but none. It took me a moment to realize that in this situation, losing my job may not be the disaster I feared. Then, I picked up this little boy. He was so weak and so scared. We laughed and cried for 45 minutes. With tears in my eyes, I left them. Less than 48 hours later, I received a phone call from Billy's mom that Billy had passed away. She and her husband simply wanted to thank me for making a difference in their little boy's life.

Billy's mom told me shortly after I left the room. Billy looked at her and said, “Momma, I don't care any more if I see Santa this year because I was held by Ronald McDonald.”

For the record, McDonald's Corporation did find it out, but, given the situation,permitted me to go on with my job. I continued as Ronald for another year before leaving the corporation to share the story of Billy and how important it is to take risks.

小题1:The underlined word “grave” in Paragraph 3 means “________”.

A.weak

B.serious

C.interesting

D.exciting小题2:When Billy asked the author to hold him, at first the author ________.

A.was unwilling to do so

B.was glad to do so

C.hesitated to do so

D.hurried to do so小题3:What lesson did the author draw from his experience?

A.To amuse others is enjoyable.

B.To take risks is important.

C.To break rules is necessary.

D.To be fired is not fearful.小题4:We learn from the story that ________.

A.the author left the corporation because he broke the rules

B.the author left the corporation because he didn't like the rules

C.the boy was quite happy with the experience with the author

D.the boy was quite happy with Santa at Christmas

题型:选择题

下列有关分区存储管理的叙述中,不正确的是( )。

A) 分区存储管理能充分利用内存
B) 分区存储管理有固定分区存储管理和可变分区存储管理
C) 固定分区会浪费存储空间
D) 分区存储管理不能实现对内存的扩充

题型:选择题

送养或者收养子女,必须要夫妻双方同意才可以吗?

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交班前要把巷道煤矸清理干净。

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