选出下列各项中加点的文言词语解释不当的一项：（） A．哀斯墓之徒有其石也，而为之

Trial and error are the source of our knowledge.

A．is

B．were

C．has

D．have been

在对话中填入适当的单词或短语，补全对话。

A: Hi, Mary! Did you go to the concert last night?

B: Yes. I 1._________ with my parents.

A: 2._________ did you like it?

B: Wonderful. Many famous singers sang at the concert. It 3.________ "Saving the Children".

A: What does it mean?

B: The concert was held to 4.________ for poor children. You know many children in the world don't have

    enough food.

A: That's true.

B: I think people all over the world 5.________ them.

A: That's right.

1._____    2._____    3._____    4._____    5._____

闭合性颅脑损伤的损伤机制包括（）

A.传递性损伤

B.挥鞭式损伤

C.胸部挤压伤并发的脑损伤

D.以上均是

比较共同决定论和相互决定论的观点。

能阻断β₁、β₂和α₁受体的药物是（）

A.拉贝洛尔

B.普萘洛尔

C.哌唑嗪

D.酚妥拉明

E.美托洛尔