问题 单项选择题

关于肾上腺糖皮质激素生理作用的描述,正确的是()

A.抑制肝外组织蛋白质分解

B.加强胰岛素作用,降低血糖浓度

C.抑制胃酸与胃蛋白酶的分泌

D.促进骨的形成而抑制其分解

E.增加血管对儿茶酚胺的敏感性

答案

参考答案:E

解析:肾上腺糖皮质激素对蛋白质代谢的作用包括:它促进肝外组织蛋白质分解,促进糖异生,故选项A不正确。糖皮质激素又有抗胰岛素作用,降低肌肉与脂肪等组织细胞对胰岛素的反应性,以致外周组织对葡萄糖的利用减少,血糖浓度升高,故选项B不正确。在对消化系统的影响,糖皮质激素能提高胃腺细胞对迷走神经及促胃液素的反应性,增加胃酸与胃蛋白酶的分泌,故选项C不正确。由于糖皮质激素对蛋白质代谢的影响,故其还可抑制骨的形成而促进骨分解,因此选项D不正确。另外肾上腺糖皮质激素在应激反应中,该系统功能增强,能提高机体对应激刺激的耐受能力和生存能力,能够增加血管对儿茶酚胺的敏感性,选项E正确。

阅读理解

At a certain time in our lives we consider every place as the possible sites(地点) for a house. I have thus searched the country within a dozen miles of where I live. In imagination I have bought all the farms, one after another, and I knew their prices.

The nearest thing that I came to actual ownership was when I bought the Hollowell place. But before the owner completed the sale with me, his wife changed her mind and wished to keep it, and he offered me additional dollars to return the farm to him. However, I let him keep the additional dollars and sold him the farm for just what I gave for it.

The real attractiong of the Hollowell farm to me were its position, being about two miles from the village, half a mile from the nearest neighbor, bounded(相邻) on one side by the river, and separated from the highway by a wide field. The poor condition fo the house and fences showed that it hadn’t been used for some time. I remembered from my earliest trip up the river that the house used to be hidden behind a forest area, and I was in a hurry to buy it before the owner finished getting out some rocks, cutting down the apples trees, and clearing away some young trees which had grown up in the fields. I wanted to buy it before he made any more of his improvements. But it turned out as I have said.

I was not really troubled by the loss. I had always had a garden, but I don’t thing I was ready for a large farm. I believe that as long as possible it is better to live free and uncommitted (无牵挂的). It makes but little difference whether you own a farm or not.

小题1:What do we know about the author?

A.He wanted to buy the oldest farm near where he lived.

B.He made a study of many farms before buying.

C.He made money by buying and selling farms.

D.He had the money to buy the best farm in the country.小题2:Why did the author decide to buy the Hollowell place?

A.It was of good market value.

B.It was next to the highway.

C.It was in a good position.

D.It was behind a nice garden.小题3:Why did the author want to buy the farm in a hurry?

A.He was afraid the owner might changes his mind.

B.He hoped to enlarge the forest on the farm.

C.He wanted to keep the farm as it was.

D.He was eager to become a farm owner.小题4:The underlined words “the loss” in the last paragraph refer to ___.

A.the money the author lost in buying the farm

B.the sale of the garden in the Hollowell place

C.the removal of the trees around the house

D.the failure to possess the Hollowell place小题5:What does the author believe as important in life?

A.To own a farm

B.To satisfy his needs

C.To be free from worries

D.To live in the countryside

单项选择题