问题 阅读理解

Surfing—the art of riding a wave on a pointed board—is the wildest, fastest natural water sport known to man. In recent years, it has developed into a major sport around the world, from Australia to South Africa. Australians brave(挑战) men—eating sharks to ride the green waves Down Under, Hawaiian experts risk(冒…之险) their lives on huge, thirty foot swells(浪涛) against the wind of Oahu; Californians of all ages go out the year-round. In the winter, surf-riders put on life-suits to ride grave waves so cold that their flesh turns blue.

Surfing is no sport for weak persons. Swimming a quarter of a mile or more, and pushing a surfboard out to where the swells are just right for riding, can be real work. Then, at exactly the right moment, you climb up the wave and go fast across the face of a powerful swell with the white water jumping at your feet. The huge wave bites at your shoulder, threatening(威胁) at any moment to smash your flat. In the next several seconds, a cool head and lightning—quick action back to the pressure of the attacking wave will bring your board under control for that great ride down the back of the great, green mountain of water. Once on the beach, you know why surfing is growing in popularity as an international sport, and you’re glad to be a member of this new water world.

小题1:The first paragraph mainly tells us ______.

A.people around the world go surfing all the year round

B.the definition(定义) of the sport

C.how to surf in the sea

D.where to surf around the world小题2:The author believes that surfing _______.

A.is not an easy sport

B.can be done by anyone

C.should be done by everyone

D.does not require courage小题3:In order to experience what real surfing is, _______.

A.you must first swim a quarter of a mile to warm your body

B.you will first ride on a board to reach the swells

C.you must first put on your life-suits before doing surfing

D.you must first swim to the swells with your board

答案

小题1:A

小题2:A

小题3:D

本文向我们介绍了冲浪这种运动的刺激性和冒险性。

1. A。主旨大意题。根据In recent years, it has developed into a major sport around the world 可知答案为A。

2. A。推理判断题。根据Surfing is no sport for weak persons(冲浪运动不适宜于那写体质虚弱的人)可知答案为A。

3. D。推理判断题。根据Swimming a quarter of a mile or more and pushing a surfboard out to where the swells are just right for riding, can be real work可知答案为D。

填空题

碱式碳酸铜是一种用途广泛的化工原料。工业上可用酸性刻蚀废液(主要成分有Cu2+、Fe2+、Fe3+、H +、Cl-)制备,其制备过程如下:

Cu2+、Fe2+、Fe3+生成沉淀的pH如下:

物质Cu(OH)2Fe (OH)2Fe (OH)3
开始沉淀pH4.25.81.2
完全沉淀pH6.78.33.2
 

(1)氯酸钠的作用是            ;滤渣的主要成分是              (写化学式)。

(2)调节反应A后溶液的pH范围应为     。可以选择的试剂是     (填序号)。

a.氨水    b.稀硫酸    c.氢氧化钠    d.碳酸铜

(3)反应B的温度如过高,则所得蓝绿色产品中可能会出现的杂质是   。(写化学式)

(4)过滤得到的产品洗涤时,如何判断产品已经洗净?                    

(5)将Na2CO3溶液滴入到一定量CuCl2溶液中得到沉淀。

① 若沉淀只有CuCO3,则相应的离子方程式为                    

② 若沉淀只有Cu(OH)2,用相应的离子方程式表示其过程                 

③ 若生成Cu(OH)2和CuCO3的混合物(即碱式盐)。则说明                

(6)碱式碳酸铜组成可表示为:aCuCO3•bCu(OH)2•cH2O,现通过下列方案测定其组成。步骤如下:

① 称量样品;② 高温分解;③ 测出CO2的质量;④ 测出水蒸汽的质量;⑤ 称量CuO。

请对上述测定方案作出评价。                                           

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