食管、胃底曲张静脉破裂出血的特点是（）A．出血速度快，呕血或便血  B．出血速度较慢

函数y=xe^x的导数是（　　）

A．f′（x）=（1+x）e^x

B．f′（x）=xe^x

C．f′（x）=e^x

D．f′（x）=2xe^x

程序编制有3个层次，其实施顺序应是______。

A．编码、画程序框图、测试

B．编码、写程序文档、排错

C．编码、测试、排错

D．编码、画程序框图、排错

Recently I paid a visit to Harvard University, where there are top class scientists and professors and the best academic system in the world.

I was pretty shocked when I first stepped onto the campus. Well, it's not even really a campus. It's more like a district in a small town.

Harvard's main buildings are from the 18th century. They look very old and simple. You might even say they're a little shabby. They don't fit the modern idea of university at all. The buildings are surrounded by grass and trees, so I felt as if I had walked into a medieval castle. But when I looked across the street, busy shops and in-fashion students made me feel like I was in the 21st century again. It creates a strong contrast and brings a special atmosphere to the school.

Our tour guide Gary took us around and told us: "You see this grass field in the center of the school? Here is where they host their graduation ceremony. They just set up tents and benches and have a very simple ceremony. Unbelievable! Who would think the most talented students just graduate on the lawn?

I saw some students put a blanket on the grass and lie down to read a book. When I listened to the soft sound of pages turning, along with chirping of the birds, I felt very calm. There was no competitive feeling at all.

Harvard has the world's first computer in its science center and there are hundreds of high-end computers too. Its religion and the literature departments are also among the best. It is the perfect mix of tradition and new technology. It makes Harvard a very attractive place to study in.

I hope one day I'll attend my dream school—Harvard.

45．The article is mainly about        . 

A．the author's campus life in Harvard     B．the author's impression of Harvard

C．Harvard's old buildings                              D．the academic system at Harvard

46．The author was most impressed by        , according to the article. 

A．Harvard's mix of tradition and new technology

B．the classes held on beautiful lawns at Harvard

C．Harvard students not taking their graduation ceremony seriously

D．the feeling of not living in modern society on the campus

47．What can we conclude from the article? 

A．Harvard campus is actually a district of a big city.

B．There are no competitions at Harvard University.

C．Graduation ceremonies are not complex at Harvard.

D．All Harvard buildings date back to the 18th century.

48．According to the article, in which fields is Harvard top in the world? 

A．Literature, arts, and law.              B．Religion, law and arts.

C．Literature, arts and computer science.   D．Religion, computer science and literature.

折旧制度属于房地产业政策手段中的（）手段。

A.金融

B.财政

C.法律

D.管理

关系到企业是否能够按照合约规定交货，进而决定了企业在市场上声誉的是( )。

A．生产进度控制能力
B．生产技术水平能力
C．生产工艺管理能力
D．生产质量管理能力