问题 单项选择题 A1/A2型题

目前应用最广泛的沉淀反应是 ()

A.絮状沉淀试验

B.免疫浊度测定

C.单向扩散试验

D.双向扩散试验

E.单向扩散试验平板法

答案

参考答案:B

解析:沉淀反应是可溶性抗原与相应抗体特异性结合所出现的反应。 沉淀反应分两个阶段,第一阶段发生抗原抗体特异性结合,第二阶段形成可见的免疫复合物。 经典的沉淀反应在第二阶段观察或测量沉淀线或沉淀环等来判定结果,如絮状沉淀试验、单向免疫扩散试验、双向免疫扩散试验; 而免疫浊度法则在第一阶段测定免疫复合物形成的速率。免疫浊度测定法的出现,使沉淀反应达到快速、微量、自动化的新阶段。因此,本题最佳答案是B。

阅读理解

It's not much, but it's home. Francis Chan, an engineer, lives in Hampstead, north London, in a flat that's just 4ft wide by 21ft long. He loves it.

Tiny though it is, it has got all the comforts. Peter Baynes, Chan’s architect (建筑师),has achieved a clever piece of design, according to architectural experts.

The Chan mini-house was built on what was once a path down the side of a big Victarian house. Not an inch of space is wasted.

When you step in through the front door, you're standing in the shower, on Britain' s only self-cleansing doormat (自动清洁门垫). A door opens on to an equally tiny toilet with washbasin. Two steps further in comes the kitchen, complete with full-sized cooker and fridge, and washer/ drier. A worktop folds down from the wall.

Another step and you're into the dining/ office area. Four people can sit here for dinner, says Chan as he sets the table-top into place. He even has a fold-down drawing-board for when he's working at home. The bed is hidden under a cover board right at the back. "I don't even have to make the bed," Chan says." I just put the cover down. "

Chan's business suits hang neatly on the wall over the bed. Daylight comes in through the skylight. The house feels like a very small boat and Chan admits he toyed with the idea of naming it the "boat-house".

"It cost around £4,700 to build last year. Now it's been valued at £30,000. It proves that good design doesn't need to cost more. It just needs a lot of care." says Chan.

小题1:By saying "It's not much" (line 1, para. 1), the author means that Chan's flat______.

A.is cheap

B.has cheap furniture

C.has a simple design

D.is fairly small小题2:Where is Chan's flat?

A.Next to a big house

B.Under an old building

C.In a busy London street

D.By the side of a country road小题3:Which of the following is the right order of things described in the text?

A.Shower, kitchen, toilet, dining table and bed

B.Shower, toilet, dining table, kitchen and bed

C.Shower, toilet, kitchen, dining table and bed

D.Shower, kitchen, toilet, bed and dining table小题4:What is the purpose of this writing?

A.To sell Chan's flat for more money

B.To tell people how to take care of small flat

C.To introduce to readers a cleverly-designed flat

D.To call on engineers to design their own home

多项选择题