游泳时,往往刚一下水就觉得水凉,过一会儿就不觉得凉了。这种感觉的变化是因为[ ]

题型:选择题

问题:

游泳时,往往刚一下水就觉得水凉,过一会儿就不觉得凉了。这种感觉的变化是因为[ ]

A.冷觉感受器产生了适应

B.体内的产热量逐渐增加

C.体表的散热量逐渐减少

D.温觉感受器产生了适应

考点:神经系统的组成和功能
题型:选择题

阅读理解。

     In my profession as an educator and health care provider, I have worked with numerous children infected

with the virus that causes AIDS. The relationships that I have had with these special kids have been gifts in my

life. They have taught me so many things, but I have especially learned that great courage can be found in the

smallest of packages. Let me tell you about Tyler.

     Tyler was born infected with HIV: his mother was also infected. From the very beginning of his life, he

was dependent on medications to enable him to survive. When he was five, he had a tube surgically inserted

in a vein in his chest. This tube was connected to a pump, which he carried in a small backpack on his back.

Medications were hooked up to this pump and were continuously supplied through this tube to his bloodstream.

At times, he also needed supplemented oxygen to support his breathing.

     Tyler wasn't willing to give up one single moment of his childhood to this deadly disease. It was not unusual

to find him playing and racing around his backyard, wearing his medicine - laden backpack and dragging his

tank of oxygen behind him in his little wagon. All of us who knew Tyler marveled at his pure joy in being alive

and the energy it gave him. Tyler's mom often teased him by telling him that he moved so fast she needed to

dress him in red. That way, when she peered through the window to check on him playing in the yard, she

could quickly spot him.

     This dreaded disease eventually wore down even the likes of a little dynamo like Tyler. He grew quite ill and,

unfortunately, so did his HIV-infected mother. When it became apparent that he wasn't going to survive, Tyler's

mom talked to him about death. She comforted him by telling Tyler that she was dying too, and that she would

be with him soon in heaven.

     A few days before his death, Tyler beckoned me over to his hospital bed and whispered, "I might die soon.

I'm not scared. When I die, please dress me in red. Mom promised she's coming to heaven, too. I'll be playing

when she gets there, and I want to make sure she can find me."

1. What is the boy Tyler's attitude towards death? [ ]

A. optimistic.

B. pessimistic.

C. sorrowful.

D. fearful.

2. Tyler requested the writer to dress him in red when he died simply because _____. [ ]

A. red is a lucky color

B. red might help to cure him

C. his mom could spot him easily

D. he could find more mates by wearing red

3. Which of the following might serve as a possible title for this passage? [ ]

A. My unusual profession.

B. A caring mother.

C. Mother and son.

D. Dying in red.

4. The underlined word dynamo in the fourth paragraph here means _____. [ ]

A. a promising and helpful youth

B. an extremely energetic person

C. a rare and beautiful flower

D. a magic and understanding superstar

题型:选择题

依据《劳动防护用品监督管理规定》的规定,生产劳动防护用品的企业生产的特种劳动防护用品,必须取得特种劳动防护用品( )。

A.许可证

B.合格证

C.销售证

D.安全标志

题型:选择题

断层走向与岩层走向平行称为()。

A.走向断层

B.倾向断层

C.斜交断层

D.平行断层

题型:选择题

强心苷提高心肌收缩力作用机制是

A.激活心肌细胞上的Na+-K+-ATP酶,提高细胞内钙离子浓度
B.激活心肌β受体,提高细胞内cAMP浓度
C.抑制心肌细胞膜上的Na+-K+-ATP酶,提高细胞内钙离子浓度
D.提高交感神经活性
E.阻止细胞外钙离子内流

题型:选择题

锅炉受热面施工中直立式组合方式的缺点是()。

A.钢材耗用量大

B.可能造成设备变形

C.不便于组件的吊装

D.占用场地面积大

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