人防工程防火分区划分宜与人防工程（）相结合。A．防爆单元  B．防护单元  C．防染

写出下列情景所对应的物理知识：

（1）钓鱼时河岸上的脚步声会把鱼吓跑，这说明                                                。 　　

（2）用手触摸正在发声的喇叭会感到振动，这说明                                             。 　　

（3）给摩托车的发动机装上消声器，这说明                                                       。 　　

（4）工人利用超声波清洗钟表零件，这说明                                                       。 　　

（5）用立体声收音机收听立体声音乐，这说明                                                     。

图1表示某地区不同日期的太阳周日视运动路线，某日当太阳周日运动至E点时，北京时间为ll时，此时全球等太阳高度曲线(如图2)所示，据此回答13～15题。

图1某地区太阳周日运动图          图2某时刻等太阳高度图

小题1:此时，下列说法可信的是

A．西安人影朝向西南

B．B地的物影朝向南方

C．D地的地方时为l8时

D．图1所示地区观测到的北极星高度为35。小题2:C点的坐标可能是 

A．135°E 60°35′7S

B．135°E 70°S

C．45°W 70°S

D．45°W 66°34S小题3:下列有关方向的判断，正确的是

A．B在A的正南方

B．D在A的西南方向

C．D在C的正北方

D．C在B的正北方

【自然灾害】下图为我国某区域图。读图回答问题。（10分）

(1)指出A地洪水灾害多发的月份，并分析其气候原因。

(2)指出A、B两地预防洪涝灾害应采取的不同措施。

No one can believe that the over 6 300-kilometer long Great Wall might disappear some day.Believe it or not,the Great Wall is being destroyed by people.Less than 20 percent of the Great Wall built in the Ming Dynasty is still perfect,but about 80 percent is in danger.The Great Wall can be called “great” mostly because of its amazing length.But we should realize that the length was made up of one brick at a time.If we do nothing to save the Great Wall,it will become a series of separate wasteland rather than a historic site.

The Great Wall is actually a series of walls built and rebuilt by different dynasties over the past 2 000 years.It began in the rule of China’s first emperor,Qin Shihuang of the Qin Dynasty (221 BC～206 BC),and lasted into the Ming Dynasty.The parts built before the Ming Dynasty have nearly disappeared.People are familiar with sections such as Badaling in Beijing and Jiayuguan Pass in Gansu because they have been open to tourists for many years.But those sections far away from the public eyes have been almost forgotten.

Few local people knew the 3-meter-high walls made of earth and stones beside them are part of the Great Wall.The lack of knowledge is considered as one of the main reasons behind human.

The bricks on the Great Wall are carried off by countryside people to build their houses,sheep corral(畜栏) and pigsties(猪圈).Some were taken away to build roads.Bricks carved with people’s names are put away as remembrance.Rubbish is spread over the battlements(城垛).The bricks can be sold for 15 yuan per tractor load.Those who destroyed and are destroying the Great Wall know its name,but are not clear about its cultural meaning.It will take a long time to let them know this.The local farmers not only carried off the body of the Wall but dug out the entire base.

It is necessary to protect the Great Wall.First of all,the officials should be aware of theimportance of the Great Wall.Young Chinese should know more about the nation’s great civilization (文明)and learn to love it.

小题1:The main reason for which the Great Wall can be called“great”is__________.

A．it was made by brick

B．it was very wide

C．it was very long

D．it had a long history小题2:Why does the author say the Great Wall might disappear?

A．It is useless from now on.

B．It will be replaced by a new one.

C．Some parts of it are being destroyed.

D．It’s too old to be used again.小题3:The underlined part “those sections far away from the public eyes” refers to the parts of the Great Wall__________.

A．that are too difficult to understand

B．nobody can watch

C．that are too far to been seen

D．that are not well known to the public小题4:What’s the main reason of the Great Wall’s being destroyed?

A．The local people are short of culture knowledge.

B．The local people need bricks and stones to build houses.

C．The local people think that the Great Wall is not important.

D．The local people are against the government.

期货价差套利的作用包括（）。

A.有助于提高市场波动性

B.有助于提高市场流动性

C.有助于提高市场交易量

D.有助于不同期货合约之间价格趋于合理