在CTC控制方式下，车站值班员发现危及行车安全的情况时，应立即按下非常站控按钮。

阅读下面短文,掌握其大意,从A、B、C、D四个选项中选出最佳选项.

   On Thanksgiving Day, a teacher asked her class of first-graders to draw a picture of something they

were thankful for. She thought that these children from poor families actually had little to be thankful  for.

And she found most of them drawing  pictures of  flowers  or tables  with  food. The  teacher  was  very

surprised to see the picture Douglas handed in. It's a hand, a simple hand.

   But whose hand? The class were very interested in the strange picture. "I think it must be the hand  of

God that brings us food," said  one child. "A farmer," said another, "because he grows  beautiful  flowers."

Finally when the others were at work, the teacher went over Douglas' desk and asked whose hand it was. "It's your hand, Teacher," he said quietly and shyly.

   She remembered that she had often taken Douglas, a dirty lonely child, by the hand while having a class 

  break. She often did that with the children. But it  meant so much to Douglas. Perhaps  this  is  everyone's  thanksgiving, not for the material things we get, but for the chance, in whatever small way, to give to

others.

1. Whose hand did Douglas draw?       

A.The farmer's.    

B. God's.

C.The teacher's.  

D. His own hand.  

2. Why did Douglas draw the picture?    

A. He was good at drawing it.          

B. His teacher asked him to draw it.

C. He wanted to show his thanks to the teacher.

D. He hoped to get a prize in drawing.

3. What do you learn about Douglas from the passage?

A. He was a lonely child.          

B. He was very active in class.

C. He always kept his hands clean.  

D. He often answered questions loudly.

4.  According to the passage, which of the following is an opinion, but not a fact?  

A. The teacher went over Douglas' desk and talked to him.

B. Different people show their thanksgiving in different ways.

C. The teacher often took Douglas by the hand after class.

D. Most of the students were drawing pictures of flowers or tables with food.

骨改建中与骨吸收有关的主要细胞是

A．成骨细胞

B．骨细胞

C．骨衬里细胞

D．前成骨细胞

E．破骨细胞

业务查询用户负责向金融信用信息基础数据库报送报文，下载反馈报文，处理反馈报文及错误数据（）

非ST段抬高心肌梗死与不稳定型心绞痛的区别主要在于（）

A.斑块是否破裂

B.心绞痛的严重程度

C.胸痛持续的时间

D.冠状动脉造影的结果

E.CK-MB≥正常上限的2倍或者肌钙蛋白升高