一节火车厢，从里面量，长13米，宽3米，装的煤高2米，平均每立方米煤重1.3吨，

下图为“某地区等高线图”，读图判定该地区的地形类型以及A点和甲村的相对高度分别是

A．山地 大于500米

B．山地 小于500米

C．丘陵 大于500米

D．丘陵 小于500米

Not long ago the movie 2012 came into screen．The people were threatened by those scenes of destroying flood, severe earthquake, terrifying hurricane and constructions representing human civilization being destroyed and even swallowed by disaster．Luckily, they are just the director' s imagination, but the present situation is not heading a positive direction, either．

Take my own experience in Alaska as an example．Once I took a trip to the glacier．Along the way there stood signposts marking the snow lines of different years．They started from the foot of the mountain, but it was at the top that I finally saw melting glaciers（融化的冰川）．My heart ached seeing the beautiful blue ice melting at every second．

Sad but true, they are the effects of global warming and the result of our human impact．Furthermore, each year the rising sea level will kill 56 million people, and that' s about the population of the entire Italy．According to studies, if the temperature keeps on rising like this, by the year 2050, some islands and coastal cities including New York, Shanghai, Tokyo and Sydney will be drowned in water．

Our fortune is in our own hands．It depends on us to shape our future, to reduce future human impact and find ways to form a peaceful relationship with our environment. Therefore, it's time for actions to be taken right now．Contribute a little to energy saving by using more efficient light bulbs and less hot water．Let recycle become our habit by thinking twice before throwing something away．Let us take public transportation as our first choice when going to a certain place．It might cost more time for now, but it' s to the benefit of a permanent future．Take care of every tree and grass around us by watering them or simply just avoid destroying them．

In a word, small drops of water make a big ocean． The earth does not belong to us．On the contrary, we belong to the earth． Please bear in mind that the earth is our home．It is our responsibility to build a brighter and better future of our planet and prevent what happened in the movie 2012 from becoming reality．                

小题1:Why does the author talk about the movie 2012 in the passage ? __________.

A．To give example．

B．To lead into the topic．

C．To make prediction．

D．To provide the evidence．小题2:How did the author feel when he took a trip to the glacier? ____________.

A．Worried．

B．Puzzled．

C．Scared．

D．Bored．小题3:It can be inferred from the third paragraph that          .

A．56 million people in Italy have been killed owing to the rising sea level

B．Some islands and coastal cities will be drowned in water by the year of 2050

C．Human beings will be in danger if we don't take actions to prevent the global warming

D．It is certain that what happened in the movie 2012 will come into reality小题4:According to the passage, you are advised to         .

A．drive our own private cars instead of taking buses to some place

B．recycle everything that is used

C．go to see the movie 2012 at once

D．work together to take good care of our planet小题5:What does the author mean by saying "small drops of water make a big ocean"?

A．Think twice before taking action.

B．It's our duty to protect the ocean．

C．Everyone together can make a difference．

D．It's important to save every drop of water．

下列结构图中，●代表前二周期元素的原子实（原子实是原子除去最外层电子后剩余的部分）， 小黑点代表未用于形成共价键的最外层电子，短线代表价键。示例

根据各图表示的结构特点，下列有关叙述正确的是[ ]

A．上述结构图中共出现6 种元素

B．甲、乙、丙为非极性分子，丁为极性分子

C．甲与丁可以发生化合反应生成离子化合物

D．向CaCl₂溶液中加入（或通入）丙有白色沉淀产生

在流行病学现场调查中，为组织方便和节约费用，选择哪一种抽样方法更合适（）

A.多级抽样

B.分层抽样

C.系统抽样

D.整群抽样

E.单纯随机抽样

中央空调动态控制系统主要是改变了（）的流量，从而实现了空调系统末端的动态变化。

A.冷冻水

B.冷却水

C.空调回水