在一个DNA分子中，腺嘌呤与胸腺嘧啶之和占全部碱基数目的54%，其中一条链中鸟嘌

患者，男性，45岁。反复发作胸骨后压榨样疼痛2年，症状常在面迎冷风疾走时或凌晨5时发作。每次发作时含硝酸甘油可缓解。平时心电图示Ⅱ、Ⅲ、aVF导联ST段水平压低0.5mm，发作时心电图正常。

以下情况发生心肌梗死的可能性小的是（）

A.冠状动脉持续痉挛

B.冠状动脉内膜破裂出血使管腔闭塞时

C.原有冠状动脉病变严重，斑块破裂

D.当患者进食大量脂肪食物以后

E.已建立充分的侧支循环的冠状动脉分支发生闭塞

.

COPENHAGEN—The world is gathered in Copenhagen for the U.N. climate summit, but Denmark’s bicycle-friendly capital has also given its name to a movement of cities trying to find a kinder way to commute（往返上下班）.

Nearly 40 percent of Copenhagen’s population cycle to work or school on ubiquitous（无处不在的） paved cycle paths. Many residents take to their bikes year-round, braving rain and snow through the winter in a city where the bicycles outnumber the people.

Amsterdam and Beijing too are known for their bicycles, but the Danish capital is where urban planners from around the world have been looking for ways to get their people out of cars and up onto bikes, an effort known as Copenhagenisation.

Klaus Bondam, Copenhagen’s technical and environmental chief, calls himself a “mega cyclist” and says the bike’s popularity stems partly from high taxes on cars which meant working-class Danes could not afford to drive in the 1930s and 40s. “Today you’ll meet everybody on the bicycle lanes --- women and men, rich and poor, old and young,” Bondam said.

The local government has during the last three years invested more than 250 million crowns ($49.42 million) in bicycle lanes and to make the traffic safer for bicyclists. Today around a third of the population drive cars to work or study, another third take public transport, while 37 percent cycle -- a figure the city aims to boost to 50 percent by 2015.

There are many benefits when citizens choose bicycles over cars: pollution and noise decline, public health improves, and more people on bikes or walking creates a sense of safety in the city. Fewer parked cars leaves more space for playgrounds, parks, shopping areas and other useful public places.

54．According to the first paragraph, Copenhagen is better known as __________.

A．a city without cars               B．a bicycle-friendly city

C．Denmark’s capital                D．the U.N. climate summit

55．We can learn from the second and the third paragraph, _________.

A．there is no path for cars during rainy and snowy days

B．citizens are limited to have only one bike for each person

C．two-thirds of people in Copenhagen cycle to work or school

D．city planners try their best to encourage more citizens to ride bikes

56．Bikes are popular in Copenhagen partly because __________.

A．the citizens are unable to afford to buy a car

B．the rich tend to keep fit by cycling to work

C．young people regard cycling a fashion to follow

D．high taxes were paid for cars in the 1930s and 40s

57．Which of the following is NOT the benefit of cycling?

A．Saving time on the road.             B．Declining pollution and noise.

C．Improving public health.             D．Creating safety in the city.

综合柜员从事会计工作应[ ]以上。

A．一年
B．两年
C．三年
D．只要大学专科以上毕业，无年限控制

气缸内发生敲声通常是由于活塞杆与（）松动脱扣。

高，膏；梁，米也。（《素问·腹中论》）“今禁高梁”王冰注。顾观光校勘记：“以生气通天论注校之，米，即粱之坏字”。此条校勘属（）

A.对校

B.本校

C.他校

D.理校