_____ alarm clock is on the desk. It's _

（14分）

A、B、C、D、E均为中学化学的常见单质或化合物，它们之间的反应关系如图所示：

（1）若A是短周期中原子半径最大的元素构成的单质，E既可溶于盐酸又可溶于NaOH溶液，E溶于NaOH溶液的离子方程式是                                    ；工业上冶炼A的化学反应方程式是                                             。

（2）若C是既含有极性键又含有非极性键的四原子分子，则实验室制取C的化学方程式是                                 ；1 mol C完全燃烧生成液态水时放热1300 kJ·mol^-1，则C完全燃烧的热化学方程式是                        。A与盐B的溶液反应时只生成气体C、碳酸钙沉淀和水，则B的化学式是              。

Canada is a very large country.It is bigger than China.China is the third largest country in the world.Canada is the second largest.It has an area of nearly 10 million sq. km. Canada has a very long coastline.To the west is the Pacific Ocean.To the east is the Atlantic Ocean.The Arctic Ocean is in the north.There are very many islands off the Pacific coast and off the Arctic coast.The biggest one in the west is Vancouver Island.In the east there is New Foundland,and in the Arctic Ocean the biggest islands are Baffin Island and Victoria Island.（Greenland is not part of Canada.It is a part of Denmark,a country in northern Europe.）

Canada has a long border with the U.S.A.in the south.In the northwest Canada borders on the American“State of Alaska”.Canada is a northern country.The Arctic Circle is （Latitude 16°N） passes through the northern part.In the south,half of the border with the U.S.A. follows line of latitude 49°N.

小题1:Which of the following statements is true?

A．U.S.A is the second largest country in the world.

B．Canada has nearly 10 million sq. km.So it is the second largest country on the earth.

C．China is as large as Canada and the second largest in the world.

D．Russia is the second largest country in the world.小题2:What ocean is in the north of Canada?

A．The Pacific Ocean.

B．The Atlantic Ocean.

C．The Indian Ocean.

D．The Arctic Ocean.小题3:There are many islands in Canada,and Vancouver Island is ________.

A．in the west

B．in the east

C．in the north

D．in the south

采用锚杆、锚喷支护的掘进工作面，在打锚杆眼前，必须先做哪些工作方可进行打眼？

新中国成立后的经济学研究，长期立足于以经典作家言论的诠释与理解上。从研究方法上看，除了少数的现实经济问题与政策研究外，大量的论著过于偏重于经济历史与经济制度的单一性研究，少有运用现代科学方法，包括数学方法来研究经济问题的。这确实是我们经济学研究与发展方面的缺陷。　　上文的观点可以概括为 ( )

A．我国建国之初很长一段时间里，经济学研究与发展存在不少缺陷

B．我国建国之初很长一段时间里，经济学研究主要偏重于经典作家言论的诠释与理解上

C．经济学研究上，对经济历史与经济制度的研究是不必要的、有缺陷的

D．现代经济学研究的科学方法主要包括用数学方法研究经济问题

强力胶添加硬化剂的主要目的是为了增强固着力。