问题 选择题

下表所列各组物质中,物质之间较下图箭头方向,通过一步反应就能实验的是

    物质

选项

 

 

 

 

ACuCuOCuSO4Cu(OH)2
BNa2CO3CaCO3CaOCa(OH)2
CH2SO4Na2SO4BaSO4Ba(OH)2
DCO2CaCO3H2OO2
 

答案

答案:D

题目分析:根据图示可知,四种物质的关系为甲→乙→丙→丁→甲。A中氢氧化铜不能一步转化为铜。此项不正确。B项氢氧化钙无法一步转化为碳酸钠。C硫酸钡无法一步转化为氢氧化钡。此项不正确。D二氧化碳可与氢氧化钙反应生成碳酸钙;碳酸钙可与盐酸反应生成水;水可在通电的情况下反应生成氧气;氧气可与碳在点燃的条件下反应生成二氧化碳。四种物质按顺序的转化均可一步实现。此项正确。所以应选D项。

阅读理解

阅读理解

     The International Space Station allows astronauts to live in space for extended amounts of time,

enabling them to explore the outside universe and conduct many experiments. However, nothing like that

exists for our oceans, and thanks to the high water pressure, ocean researchers are able to explore what

lies undersea for very short periods of time.

     They are therefore never able to fully explore the deep inside areas of our oceans. However, if French architect Jacques Rougerie has his way, that will change soon. 

     Jacqucs has designed a ship that will allow researchers to spend a long period of time observing the sea life and conducting experiments. The huge 167ft ship, named 'Sea Orbiter', consists of two areas-one

above the water where the scientists and crew will live, and a lower pressurized deck (甲板), where

scientists will be able to spend as much time as they wish. Since it is powered by sea currents and wind, he expects it to drift (漂流) along the oceans slowly, taking about two years to circumvent the globe.

     Jacques will make their life as comfortable as possible in the ship. Besides being equipped with the

latest sailing tools and communication equipment, the ship will also have a gym, a television and a DVD

player. And these guys will not be eating freeze-dried food like astronauts. Instead, Jacques, an

accomplished chef, plans on cooking them delicious meals every day.

     The biggest problem to this giant ship is the cost, which is expected to be over $500 million-per ship!

However, Jacques, who strongly believes that the secrets of our oceans may be the key to solving global

warming and a vital supply for food and medicine in the future, is confident he will be able to convince

governments all over the world to help out, and expects to start construction on not one, but four or five of these amazing ships soon!

1. Why can't ocean researchers explore the deep oceans for a long time?      

A. Because they can't stand the high water pressure.                        

B. Because it's too cold in deep ocean.                                      

C. Because time for experiments is too limited.                              

D. Because it's dangerous to observe the sea life.                          

2. The underlined word "circumvent" probably means_____.              

A. fly away                                                                  

B. get around                                                                

C. travel through                                                            

D. move into                                                                  

3. From the fourth paragraph we can learn that_____.                     

A. Jacques intends to design the ship mainly for sightseeing and traveling    

B. living a comfortable life helps to do the ocean research quickly          

C. it's much more expensive to eat freeze-dried food                        

D. researchers on Jacque's ship will live more comfortably than astronauts  

4. Which of the following would be the best title for the text?              

A. Sea Orbiterthe ship of the future                                        

B. A new way to explore the deep oceans                                      

C. A great architectJacques Rougerie                                        

D. Travel around the globe in Sea Orbiter                                    

单项选择题