下列不属于产业间制约因素的是（）。A.产品的差异程度 B.工艺水平的相似性 C.依赖

南宋后期的诗论家严诩在《沧浪诗话?诗评》中说：“或问唐诗何以胜我朝？唐以诗取士，故多专门之学，我朝之诗所以不及也。”严诩以为唐朝诗歌繁荣的原因是唐朝[ ]

A．经济繁荣，国力强盛

B．科举制度，考查诗赋

C．知识分子队伍空前强大

D．士人群体的刻苦钻研

外汇风险中的交易风险是指由于外汇汇率波动而引起的应收资产与应付债务价值变化的风险。（）

下列静脉属门静脉系统的是（）

A.中央静脉

B.肠系膜上静脉

C.肠系膜下静脉

D.直肠上静脉

E.直肠下静脉

The nervous-looking young man had waited for a few moments—outside the jeweler’s before he got enough courage to enter. He was warmly greeted by a young assistant. James felt a rush of blood to his face as he explained he would be bringing in his future wife to choose a birthday present. The assistant listened carefully and told him he’d better buy a necklace. He wasn’t used to buying jewellery and was a little worried about over-spending. After some discussion as to a reasonable price and the type, the assistant showed him dozens of necklaces and helped him to choose. At last James chose one and left the shop promising to return at five o’clock. When, half an hour later than planned, James did return to the shop with his future wife, Laura, the assistant acted as if she had never seen him before. When she was asked to show them some necklaces, she first brought out some inexpensive ones for them to choose, and then gave them the one she had prepared. A choice was soon made and they went away satisfied. James would certainly come back to buy what he wanted.

52. A good title for this passage is________.

A. A Clever Assistant                 B. Buying a Birthday Present

C. How to Choose a Necklace          D. A Brave Young Man

53.The word “overspending” in this passage means__________.

A. spending too much money

B. spending too much time

C. spending more time than he planned

D. spending too much time and too much money

54. When James told the assistant why he wanted to buy a present, his face_______.

A. turned pale                   B. turned  red       C. turned yellow                 D. turned black

55. James and Laura reached the shop at        .

A. 4:30       B.5:00         C.5:30         D.6:00

56. James would come back to buy what he wanted because_______.

A. the assistant knew how to satisfy the people who came to buy things

B. the necklace was good

C. Laura liked the necklace

D. the assistant who served James was very beautiful

习惯上将压头表示成单位体积气体所获得的能量，所以风机的压头又称为（）。

A.全压

B.扬程

C.负压

D.风力