按照经营产品分类，保险公司可以分为财产保险公司和人寿保险公司。

如果（a-2）x+（b+1）y=13是关于x，y的二元一次方程，则a，b满足什么条件？

慢性子痈气滞痰凝可用：

A．有脓
B．无脓
C．脓已成熟
D．脓浅
E．脓深

阅读理解

     Eddie McKay, a onceforgotten pilot is a subject of great interest to a group of history students in

Canada.

     It all started when Graham Broad, a professor at the University of Western Ontario, fofund McKay's

name in a footnote in a book about university history.McKay was included in a list of university alumni

(校友) who had served during the First World War, but his name was unfamiliar to Broad, a specialist

in military history.Out of curiosity, Broad spent hours at the local archives(档案馆)in a fruitless search

for information on McKay.Tired and discouraged, he finally gave up.On his way out, Broad's glance

happened to fall on an exhibiting case showing some old newspapers.His eye was drawn to an old

picture of a young man in a rugby uniform.As he read the words beside the picture, he experienced a

thrilling realization."After looking for him all day, there he was, staring up at me out of the exhibiting case,

"said Broad.Excited by the find'Broad asked his students to continue his search.They combed old

newspapers and other materials for clues.Gradually, a picture came into view.

     Captain Alfred Edwin McKay joined the British Royal Flying Corps in 1916.He downed ten enemy

planes, outlived his entire squadron(中队)as a WWI flyer, spent some time as a flying instructor in

England, and then returned to the front, where he was eventually shot down over Belgium and killed in

December 1917.But there's more to his story."For a brief time in 1916 he was probably the most

famous pilot in the world, "says Broad."He was credited with downing Oswald Boelcke, the most

famous German pilot at the time."Yet, in a letter home, McKay refused to take credit, saying that

Boelcke had actually crashed into another German plane.

     McKay's war records were destroyed during a World War ? air bombing on London-an explanation

for why he was all but forgotten.

     But now, thanks to the efforts of Broad and his students, a marker in McKay's memory was placed

on the university grounds in November 2007."I found my eyes filling with tears as I read the word '

deceased' (阵亡) next to his name, "said Corey Everrett, a student who found a picture of Mckay in

his uniform."This was such a simple example of the fact that he had been a student just like us, but instead of finishing his time at Western, he chose to fight and die for his country."

1. What made Professor Broad continue his search for more information on McKay?

A. A uniform of McKay.

B. A footnote about McKay.

C. A book on McKay.

D. A picture of McKay.

2. What did the students find out about McKay?

A. He trained pilots for some time.

B. He lived longer than other pilots.

C. He died in the Second World War.

D. He was downed by the pilot Boelcke.

3. McKay's flying documents were destroyed in________.

A. Belgium

B. Germany

C. Canada  

D. England

4. We can learn from the last paragraph that McKay________.

A. preferred fight to his study

B. went to war before graduation

C. left a picture for Corey Everrett

D. set an example for his fellow students

5. What is the text mainly about?

A. The research into war history.

B. The finding of a forgotten hero.

C. The pilots of the two world wars.

D. The importance of military studies.

能分泌抗中肾旁管激素的胚胎细胞是（）。

A.睾丸的精原细胞

B.睾丸支持细胞

C.卵巢的卵原细胞

D.卵巢的卵泡细胞

E.睾丸间质细胞

磁力泵除对（）与磁路设计有较高要求外，其余部分技术要求不高。

A.磁性材料

B.外壳材料

C.轴承材料

D.轴材料