支气管哮喘时不会出现下述哪项病理变化（） A.支气管平滑肌肥厚 B.黏膜水肿、黏膜及

我国规定最低的就业年龄为（）周岁。

A.15

B.16

C.18

D.19

从1950年秋开始，一场涉及2.6亿农村人口的空前规模的运动，在广大的新解放区分批分期陆续展开。与之相关的文献是（     ）

A．《中华人民共和国宪法》

B．《中国人民政治协商会议共同纲领》

C．《中华人民共和国义务教育法》

D．《中人民共和国土地改革法》

如图1—8，已知R₁=R₂=100Ω，R₃=50Ω，求总电阻R_ab等于多少

阅读理解

Dear Economist,

     My newlywedded wife and I are deeply in love. There is, however, one issue that threatens the

happiness of our marriage. I absolutely insist on shopping at Walmart. My  wife, meanwhile, would 

 rather  avoid Walmart at all costs. I have recently tried to convince her that not only does Walmart

offer the lowest prices known to man, but that the chain is also a force for good-lower prices mean

better standards of living for all consumers, increased global trade means a tighterknit(紧密团结的)

international community, and efficient operations translate into higher productivity growth for the

economy. My wife complains about poor labour policies, the fact that Walmart squeezes suppliers,

and that it puts local shops out of business.

     Who is right? Will our marriage survive?

     Brian Gee

     Dear Brian,

     I have to agree with you about Walmart. Jason Furman, then an economist at New York University,

now an adviser to President Obama, famously argued in 2005 that Walmart was unwittingly (不知不觉地) a  progressive success story.The chain's prices don't much affect me(I prefer Whole Foods)but

Furman estimated  that they benefited lowandmiddleincome Americans to  the sum of around $250

billion a year.

      Walmart does not pay much, so it may depress  wages.Then again, it may increase wages by

offering jobs to the otherwise-unemployed. Either way, the benefits of low prices to Walmart shoppers

far outweigh any seemingly reasonable costs to Walmart employees. And while it is true that Walmart

employees tend to be poor, the same is true of Walmart shoppers.

      Armed with this information you can face your wife with confidence. You are sure to win the

conversation. The divorce is likely to be more argued.

      Economist

1. What concerned Brian Gee so much that he wrote the letter?

A. His wife refuses to shop at Walmart.

B. They are faced with a divorce.

C. They  can't  afford  the  costs  of  shopping  at   Walmart.

D. They are in conflict about shopping at Walmart.

2. Brian Gee's wife tends to hold the opinion that________.

A. it is wrong for Walmart to depress its employees' wages

B. consumers' lives have improved thanks to Walmart

C. Walmart's business operation increased productivity in economy

D. Walmart's business increases global trade

3. What can be inferred from the reply letter?

A. Some employees accept the low pay to keep the job.

B. Walmart appeals to only poor consumers and poor employees.

C. Employees suffer from Walmart's low prices more than consumers.

D. Jason Furman, a New York University economist, spoke highly of Walmart.

血钙中发挥生理作用的钙是

A．碳酸氢钙

B．柠檬酸钙

C．草酸钙

D．蛋白质结合钙

E．离子钙