问题 单项选择题

对糖皮质激素作用的叙述,错误的是()

A.促进蛋白质分解,抑制其合成

B.分泌过多可引起向中性肥胖

C.减弱机体对伤害刺激的抵抗力

D.促进糖异生,升高血糖

E.增加血管平滑肌对去甲肾上腺素的敏感性

答案

参考答案:C

解析:糖皮质激素的作用:①对物质代谢的影响:促进糖异生,升高血糖;促进蛋白质分解;促进脂肪分解。②对水盐代谢的影响:较弱的贮钠排钾作用。③使血中红细胞、血小板和中性粒细胞的数量增加,使淋巴细胞和嗜酸性粒细胞的生成数量减少。④糖皮质激素能增强血管平滑肌对儿茶酚胺的敏感性(允许作用),有利于提高血管的张力和维持血压。⑤提高机体对应激刺激的耐受力和生存能力。

单项选择题
阅读理解

阅读理解。

     More and more people are annoyed at the continually rising house prices. They want to know who is to blame for it. Local governments, developers and speculators (投机商) share a vested (既得的) interest in it. People who are really in need of homes are most likely to suffer heavy losses.

     Many local governments depend on selling land to keep its normal operation. The higher land prices,

the more money. Therefore, developers back the local governments by buying land at high prices. In

return, the governments make favorable policies to help the developers. For example, drive all the possible home buyers to this nasty (危险的) market. They even encourage large numbers of speculators to catch

more people.

     Rising house prices have already become the fence which divides the Chinese society. It has caused

widespread dissatisfaction. The government will lose the support of the common people if leaving house

prices out of control. Besides, rising house prices will stop us building the new countryside as the present

policy actually forbid people to flow freely from cities to the countryside.

     Collecting taxes on houses can fundamentally solve this problem. On one hand, it will discourage the

speculators. On the other hand, it will offer a stable tax resource apart from reducing the sales cost of the

developers. Secondly, stop the developers selling the houses before completion. If so, the developers will certainly try their best to sell all their houses once completed. And this will also lower speculators'

expectation of price rising, which will decrease speculations.

1. The only victims of rising house prices are _____.

A. governments  

B. real home buyers

C. developers  

D. speculators

2. The local governments reward the developers by _____.

A. offering enough land  

B. allowing sales in advance

C. providing enough buyers  

D. making favorable policies

3. We can infer from the passage that continually rising house prices will _____.

A. benefit the government

B. draw more home buyers

C. help the housing industry develop soundly

D. affect the sound development of the Chinese society

4. Collecting taxes on houses has all the following effects except _____.

A. making the developers do their best to sell their houses

B. cutting down speculations

C. supplying a stable tax resource for the government

D. decreasing the sales cost