题目

c(N0048)相同的下列溶液①NH4Cl②(NH4)2SO4③NH4HSO4④NH4HCO3,其物质的量浓度由大到小的顺序是（） A.②④①③ B.②③①④ C.①④③② D.④①③② 答案：D 解析:①③④相比，由于④中NH水解得到促进，水解程度大于①，③中水解受到抑制，c(NH)水解程度小于①，故这三份溶液中如果c(NH)相等，必然有④>①>③的关系，而②中(NH4)2SO4物质的量浓度与③相比，当二者浓度相等时，②中c(NH+4)接近③的2倍，若c(NH)相等时，必然(NH4)2SO4浓度接近NH4HSO4浓度的二分3、The brain of an insect isn’t very big. But insects are somehow still able to make lots of important decisions. Bees, ants and roaches(蟑螂) build hives(巢穴)with thousands of workers doing specialized work. The jobs are done without a head or even a plan. How do insects manage this? To solve the mystery, scientists in Belgium spent months building robotic roaches and then putting them among real roaches. The final goal of the research is to find out how the simple behavior of individuals gives rise to a collective decision. The roach is a good starting point for trying to answer the big question because its social system is simple enough for scientists to study. The first step was to build robots that real roaches would accept as their own. Although the robotic roaches don’t look much like the real thing, they have similarities with them in three key ways: they naturally head toward dark areas, they are influenced by the behavior of other roaches, and even more importantly, they smell like roaches. The next step was getting the robotic and real roaches to work together on common tasks. In experiments, the robots would collectively head towards a dark place, copying the behavior of natural roaches. That got the researchers wondering: if you program the robotic roaches to go toward the lighted place, would the real roaches follow, going against their natural instincts.(本能) ? They will – it turned out. Many of the real roaches followed the robots to a lighter shelter. But influence turned out to be a two- way street. On occasion, the real roaches were able to override the programming of the robot roaches and get them to turn into dark hiding places. Being social creatures, both the robotic and natural roaches were paying attention to and following the example set by others. In theory, it would be possible to create a robot that could influence collective decision-making in humans. To do this, researchers would have to invent a robot that people would accept. Fortunately, the technology isn’t there yet. 1．Why do scientists choose the roaches to study?      A．They are social creatures      B．Their social system is simple.      C．They are able to build their hives quite well.      D．It is easy to create robotic ones. 2．The robotic roaches are accepted by real ones because of all of the following EXCEPT that _________ .        A．they smell like real ones        B．they look exactly like real ones        C．what they do are somewhat influenced by other roaches        D．they naturally head toward dark areas 3．What’s the author’s attitude to creating a robot that would influence collective decision- making in humans?      A．Uninterested      B．Positive              C．Negative            D．Doubtful 4．Which of the following might be the best title of the passage ?      A．Robotic Roaches                     B．Scientists’ Research      C．Amazing Insects                 D．Insects’ Social System