下列有关肿瘤的实验室检查叙述错误的是（）。 A.CEA在结肠癌、胃癌、肺癌均可升高

阅读理解。

     There is a wonderful story about a young girl who had no family and no one to love her.

     One day, feeling very sad and lonely, she was walking through a grassland when she noticed a small

butterfly caught in a thorn (荆棘) bush. The young girl carefully released the butterfly. Instead of flying

away, the little butterfly changed into a beautiful fairy. The young girl rubbed her eyes in disbelief.

     "For your wonderful kindness," the good fairy said to the girl, "I will give you any wish you would like."

The little girl thought for a moment and then replied, "I want to be happy."

     The fairy leaned toward her and whispered in her ear. Then the fairy disappeared.

     As the little girl grew up, there was no one in the land as happy as she. Everyone asked her secret of

happiness. She would only smile and answer, "The secret of my happiness is that I listened to a good fairy

when I was a little girl."

     When she was very old and on her deathbed, the neighbors all gathered around her, that her unbelievable

secret of happiness would die with her. "Tell us, please," they begged, "Tell us what the good fairy said."

The lovely old woman simply smiled and said, "She told me that everyone, no matter how secure they seemed,

no matter how old or young, how rich or poor, had need of me."

1. _____ the girl felt sad and lonely.

A. There were many friends but

B. There was nobody to love her so

C. There was nothing to do

D. Seeing the butterfly was caught

2. Noticing the butterfly was caught by the thorn, the orphan girl _____.

A. helped the butterfly escaped from the thorn

B. felt sorrow, but she didn't go up to help it

C. fell down on it too

D. failed to help it release from the thorn

3. The only thing that the little girl wanted was _____.

A. to be rich

B. to have her own parents

C. to have a lot of friends

D. happiness

4. The neighbors all gathered around the old happy woman when she was dying, because _____.

A. they loved this woman deeply and they didn't wanted her to die

B. the woman had lots of money to be shared as soon as she died

C. they wanted to know the secret of her lifetime happiness

D. they wanted to pray for her after her death

板材的机械矫正是通过矫正机对钢板进行（）弯曲，使钢板（）的纤维趋向（），而达到矫正的目的。

铝对人体健康有哪些危害？

于体外反搏疗法叙述正确的是（）。

A.以心电R波作触发

B.以心电P波作触发

C.以心电T波作触发

D.在心脏进入舒张晚期时充气

E.在心脏进入收缩早期时充气