设函数f（x-1）=x+x2+x3+…+xn（x≠0，1），且f（x）中所有项的

阅读短文，完成各小题。

     Some countries have large numbers of earthquakes. Japan is one of them. One of the most serious

earthquakes in world history took place in Japan in 1923. The shock and fires caused by it destroyed

much of Tokyo and Yokohama and left more than 7000 dead. Other countries do not have many. For

examples, there are few earthquakes in Britain, France, Germany.

      There is often a great noise during an earthquake, but it is not always. The earth rocks. Houses fall

down. Railway lines are broken. Sometimes many people are killed in an earthquake. People think earthquakes

often happen near volcanoes (火山), but this is not always true. The centers of some are under the sea.

The bottom of the sea suddenly moves. The powerful forces inside the earth break the rocks. The coast

is rocking and great waves are caused there. These waves travel long distances and rush over the land

when they reach it. They are strong enough to break down houses and other buildings; sometimes they

break more buildings than earthquake itself.

     What kind of building stands up best in an earthquake? A building with concrete (水泥) walls is perhaps

the best. A steel frame (框架) will make it even stronger. The frame holds the different parts together and

the walls do not easily fall. There is less chance of fire because concrete and steel (钢材) does not burn.

This kind of building is the safest. Today modern concrete and steel apartment buildings are commonly

seen in cities of Japan.

1. Why do we say that an earthquake is terrible?

_____________________________________________________________________.

2. What kind of building is the safest for us to live in against earthquakes?

_____________________________________________________________________.

3. Which country has the largest number of earthquakes, Britain, Japan, or France?

_____________________________________________________________________.

4. 判断正误：正确的在括号里写T，错误写F。

( ) The text mainly tells us how to protect ourselves when the earthquake happens.

5. Put the underlined sentences into Chinese.

_____________________________________________________________________.

氧债是指什么？（）

A.清除无氧代谢产物乳酸所需要的氧

B.进行有氧代谢时分解糖与脂肪所需要的氧

C.氧供应能满足运动时对氧的需要，进行有氧代谢时所用去的那部分氧

影响一个地区长期或某段时期气候变化的原因，是众多而复杂的，人们至今还无法确切说明各种因素对气候变化的影响程度。但是可以断言：即使人类社会发展到今天，从总体讲，自然因素仍然是影响气候的主导因素。人类活动至今仍然不足以影响地区性气候的基本属性，更不足以引起冰期或间冰期等巨大的气候变化。 这段文字意在说明( )

A．一个地区的气候是多种因素共同作用的结果

B．地区性气候的基本属性主要取决于自然因素

C．人类活动不足以对一个地区的气候产生影响

D．人类对气候影响因素的了解与分析还不足够

下列除去杂质的方法正确的是（　　）

①除去乙烷中混有的少量乙烯：通过酸性KMnO₄溶液后，干燥气体；

②除去硝基苯中混有的少量NO₂：加少量NaOH溶液振荡，待分层后分液

③除去苯中混有的少量苯酚：加入浓溴水后过滤取滤液；

④除去乙醇中混有的少量的乙酸：加足量生石灰，蒸馏．

⑤除去乙炔中混有的少量H₂S：通过CuSO₄溶液后，洗气；

⑥除去溴苯中混有的少量溴：加入KI溶液，充分反应后，弃去水溶液．

A．①②③⑤

B．②④⑤

C．③④⑤

D．②③⑥

业主管理房产的方式，由自管自修转向委托物业服务企业管理，其本质是将自己的物业______职能从管理权限中分离出去。

A．经营
B．管理
C．领导
D．服务