问题 单项选择题

导致血小板聚集的因素中作用最强的是()

A.凝血酶

B.花生四烯酸

C.胶原

D.肾上腺素

E.ADP

答案

参考答案:A

解析:理论上任何途径的血小板聚集过程都涉及血小板活化,最终归之于血小板膜糖蛋白(GP)Ⅱb/Ⅲa复合物。凝血酶在其中占有重要地位。凝血酶是最强的血小板活化剂。

阅读理解

Mr. Black and Mr. White were two very famous artists in the city. Their drawings were also very popular in the city. But they tried to see who could draw the best picture.

One day they asked an old man to be the judge. Mr. Black drew an apple tree. He put his picture in the field. Soon the birds came and tried to eat the apples. The old man saw it and said, “You have certainly won. Mr. White cannot draw so good a picture as yours. But we will go to see his picture.”

They went to Mr. White’s house. There were nothing but red beautiful curtains on the wall. The old man asked, “Where is your picture, Mr. White?” He said, “Lift the curtains, and you will find my picture.” The old man tried to lift the curtains but found that they were drawn there. They were Mr. White’s picture. The old man said, “Birds thought the apples were real. Men thought the curtains were real. So Mr. White won. His picture is the best one.”

小题1:Mr. Black drew       .

A.an apple tree

B.the best picture

C.curtains

D.birds小题2:The old man thought Mr. Black’s picture was good because       .

A.it was in the field

B.it was an apple tree

C.the birds liked it

D.the birds thought it was real小题3:Mr. White’s picture was       .

A.an apple tree

B.curtains

C.nothing

D.an old man小题4:Which of the following statements is TRUE?

A.The birds came and ate the apples up.

B.The old man said Mr. White’s picture was the best one at last.

C.The two pictures were not so good.

D.The curtains on the wall were real.

单项选择题