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问题 单项选择题

下列各项利用了细胞呼吸原理的是（）

①真空包装水果可延长保存期

②沼气发酵

③利用葡萄、粮食和酵母菌酿酒

④温室大棚适当增加二氧化碳、肥料提高光合速率

A.②③④

B.①②③

C.①③

D.①③④

答案

参考答案：B

解析：

真空包装可以隔绝空气中的氧气参加反应，抑制有氧呼吸，减少有机物的氧化分解，沼气发酵是利用了甲烷细菌的无氧呼吸，酒的酿造是利用酵母菌的呼吸作用原理，温室大棚适当增加二氧化碳、肥料提高光合速率是利用了合作用的原理。B正确。

考点：本题考查细胞呼吸原理应用的知识。意在考查能理解所学知识的要点，把握知识间的内在联系，能从课外材料中获取相关的生物学信息，并能运用这些信息，结合所学知识解决相关的生物学问题的能力。

单项选择题

治疗特发性血小板减少性紫癜血热妄行型应首选

A．归脾汤或保元汤
B．犀角地黄汤
C．右归饮
D．五阴煎
E．圣愈汤

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单项选择题

Rising Prices Cause House "Apartheid"


涨价导致房屋的“种族隔离”


The Government has admitted that soaring house prices have left people on average incomes, such as teachers and nurses, locked out of buying their first homes across large parts of southern England, including London and most of the South East.
A spokeswoman for the Deputy Prime Minister, John Prescott, admitted last night that there was now an effective "housing apartheid", with people in their own homes pulling further and further away from those yet to get on the property ladder.
With house prices rising at between 15 and 20 percent a year, incomes, which are rising at between 5 and 10 percent a year, cannot keep up.
"Increasing housing supply is a national priority. In large areas of the wider South East, house purchase remains out of reach for families with average household incomes," the official said．
A new report out tomorrow will reveal the full scale of the housing crisis. The study by Cambridge University for the housing charity Shelter reveals that the Government will need to spend ￡3.5 billion a year to solve the housing problem.
More than 50,000 new homes are needed every year to help people on lower incomes to have their own homes. By 2014 a city the size of Leeds will need to be built.
Critics point out that, without the money, millions of people employed in the public sector will be unable to move to the South East to fill vacancies.
Without a new influx of staff, many hospitals and schools say that they will struggle to maintain standards. The Government is now expected to announce a package of measures in the Budget to try to help first-time buyers. The Treasury is considering raising the point at which people have to pay stamp duty, a tax paid on every house purchase.
The present threshold of ￡60,000 has remained unchanged since 1993, despite house prices increasing by 160 percent in that time.
Gordon Brown, the Chancellor, faces being accused of maintaining the threshold as a way of raising more tax because as house prices rise more and more people are dragged into paying the surcharge. More than 75 percent of all first-time buyers now pay the tax.
"The Government has to act," said Adam Sampson , the director of Shelter. The lack of affordable housing has a destabilising effect on the economy and its cost in human terms is massive.
"Successive governments have spoken about the growing housing crisis. It has now got to the point where it cannot be ignored any longer. Housing should be given the same priority as the other key areas of public life, health and education. "
The report says that more than three-quarters of all new homes are needed in the South of England, with about 20 percent in the North and the Midlands.
Shelter’s figures on housing demand will form the basis of a Treasury review of housing to be published at the time of the Budget next week. The review, by Kate Barker, is likely to say that tens of thousands of new houses are needed and that planning restrictions should be relaxed so that housing developments can be built more easily.
She will also criticise a culture of nimbyism which has crept into many, particularly rural, towns. Many local communities block new housing even though it is desperately needed．
A study released this weekend by the Halifax revealed that first-time buyers cannot get on to the property ladder in 80 percent of towns and cities across the country. The bank said that areas were classed as "unaffordable" if first-time buyers needed to borrow more than 4.27 times the local average salary to buy a home.
By that calculation, 100 percent of towns and cities in East Anglia were out of reach of first- time buyers, while 98 percent of towns and cities in the South West were unaffordable.
The Government is set to announce large amounts of extra funding for house building in the Budget. By 2006 the amount spent will have increased by ￡900 million, or 25 percent.
There will also be a ￡5 billion pot of money provided for affordable housing by 2006.

According to the passage, housing apartheid’ refers to a situation where______.

A．houses are only built in specific places
B．houses in some places become too expensive for people to buy
C．black people and white people live in different houses in a place
D．regulations are enforced on house pricing
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