关于二尖瓣狭窄的血流动力学改变，下列哪项是错误的
A．肺毛细血管压力增高
B．左心房压力增高
C．左心室肥大
D．肺动脉高压
E．血流经二尖瓣口时跨瓣压差增加
参考答案：C
解析：[解题思路] 二尖瓣狭窄时由于左心房排血受阻，房压升高，肺静脉和毛细血管淤血，压力升高，肺动脉也可由于肺小动脉管壁增厚，狭窄而压力显著增高。此时，左心室处于相对少血状态。
| 阅读短文，根据其内容回答问题。 |
| You have plans for future study. A country also has plans. At the beginning of March, the 2006 National People's Congress (NPC, 全国人民代表大会) passed China's 11th Five-Year Plan. The plan promises higher incomes (收入), better education and less pollution by 2010. If the promises all come true, Chinese people's lives will change a lot. Let's take Cai Wenkang as an example. Roads and water The 13-year-old boy is a junior one student in Hunan. His parents are both farmers. According to the plan, Cai's family will benefit a lot. For example, the government will provide safe drinking water to 100 million countryside people by 2010. Asphalt (沥青) roads will be built to connect all towns and villages. So, Cai will soon drink running water instead of well water. Trips on the bus will be more comfortable. More money Also, Cai's parents don't need to worry about money to pay to send their son to school in two years. The plan promises that by the end of 2007, countryside students won't need to pay school fees until they finish junior high. People's lives will continue to improve. Each year, people will get 5 per cent more money, says the plan. That is to say, if an average Chinese family made about 10,000 yuan in 2005, in 2010 the family could earn 12,800 yuan a year. At that time, as the plan describes, China should see great progress in science. Chinese astronauts would land on the moon. China might build its own airliners (客机). So in 2010, if Cai goes to university by air, he probably would find the airplane is not from Boeing or Air Bus. It's made in China. |
| 1. Where is Cai Wenkang living, in a town or in the countryside? _______________________________________________________ 2. Will Cai Wenkang have to pay for his education by the end of 2007? _______________________________________________________ 3. How much more money will the family earn in 2010? _______________________________________________________ 4. What will probably happen in science in 2010? _______________________________________________________ 5. What is the passage mainly talking about? _______________________________________________________ |