参与I型变态反应的抗体是（）.

一港湾淤质黏土层厚3m左右，经开山填土造地填土厚8m左右，填土层内块石大小不一，各别边长超过2.0m，现拟在填土层上建4～5层住宅，在下述地基处理方法中，采用（）方法比较合理。 （）

A.灌浆法

B.预压法

C.强夯法

D.振冲法

王阿姨要做一个长4.5m、宽0.6m、高75cm的玻璃柜台。现在要在柜台的各边都安装上角铁，至少需要角铁多少米？

四妙勇安汤治疗脱疽适用于（）

A.虚寒型

B.血瘀型

C.气血两虚型

D.肾虚型

E.热毒型

设D是xOy平面以(1，1)，(-1，1)和(-1，-1)为顶点的三角形区域，D₁是D的第一象限的部分，且

则( )

阅读理解。

     The great Snipe is a little shore bird-not one that would be considered a great athlete. However, a

recent study has shown that these slightly fat birds not only fly nonstop for long periods of time during

their annual migration, but do so at record speeds.

     The brown migratory birds (候鸟) that are about the size of a pigeon (鸽子) spend their summers in

Eastern Europe and winters in Central Africa, a distance of about 2,800 to 4,000 miles. In May 2009, a

team of researchers led by Dr. Raymond Klaasen from Sweden's Lund University fitted ten Great Snipes with tiny geo-locating devices (装置) that allow scientists to figure out when and where the birds travel,

and let them loose. The following year they found three of the birds and took back the devices. What

they discovered was quite stunning.

     All three birds had flown nonstop to Central Africa in August of 2009-one had flown 4,225 miles in

just 3.5 days. The second one had covered a distance of 3,833 miles in three days, while the third had

managed to fly 2,870 miles in a mere 48 hours or two days. Even more surprising was that these birds

had traveled at speeds that averaged about 50 miles per hour-making it the fastest known migration ever.

     While many birds migrate longer distances, they do so over a period of a few months, resting and

feeding in between. However, despite the fact the Great Snipe has plenty of opportunities, it does not

stop. And they do the entire flight with their own power, with no assistance from the wind. The tiny bird

is able to make this unbelievable direct flight because of all the fat it gradually gathers in its body, which it

then uses as fuel.

     Native no North Eastern Europe, Great Snipes live in marshlands and wet meadows (沼泽地和湿草地). But they are also on the list of endangered animals because of loss of habitat.

1.What is the text mainly about?

A. A new device used to follow birds

B. A recent research on endangered birds

C. A unique migration route of birds

D. An unusual species of migratory bird

2. The underlined word"stunning"in Paragraph 2 can best be replaced by "______".

A. amazing

B. worrying

C. disappointing

D. fascinating

3. What do we know about the three birds scientists found?

A. The second spent the least time flying

B. They could fly about 1,200 miles a day

C. The third flew the slowest among the three.

D. They started their journey from Central Africa

4. During their migration, Great Snipes _____.

A. frequently pause to feed

B. fly with the help of the wind

C. use the fat in their body as fuel

D. sometimes take the opportunity to rest

5. This text can be classified as _____.

A. humorous

B. explanatory

C. novelistic

D. poetic