【文章內(nèi)容簡(jiǎn)介】 with smartphones and also the increased psychological distance which can occur when we use such devices pared to PCs.” As for why the researchers started this study, Dr BarqueDuran noted, “Due to the fact that our social lives, work and even shopping take place online, it is important to think about how the contexts where we typically face moral decisions and are asked to engage in moral behavior have changed, and the impact this could have on the hundreds of millions of people who use such devices daily.” It’s clear that we need more research on how our devices affect our moral decision making because we’re using screens at an ever increasing rate. 28. Why did the author mention the trolley problem? A. To introduce a difficult problem to readers. B. To introduce the aim of carrying out the study. C. To show an example of the questions in the study. D. To show the difficult in dealing with dilemmas. 29. How do the smartphone users of the study behave in dealing with emotional dilemmas? A Calmly. B. Cruelly. C. Hesitantly. D. Enthusiastically. 30. Dr Albert believes that pared with PCs, samrtphones . A. help people bear more pressure B. help people make decisions quicker C. make people feel more mentally distant D. make people stay happier to solve problems 31. What can we infer from the text? A. Shopping online has a great effect on making moral decisions. B. The people using smartphones are more than those using PCs. C. People who often use samrtphones or PCs always meet with dilemmas. D. It is mon for people to be involved in making moral decisions in daily life. D There is a breakthrough in building aircrafts. Bendable wings covered with overlapping(部分重疊 ) pieces resembling fish sizes could be used to build swifter, fuelefficient aircraft, a new study finds. Nowadays, conventional aircrafts typically rely on ailerons (副翼 ) to help control the way the planes tip as they fly. However, when the Wright brothers flew the first airplane, Flyer 1, over a century ago, they used no ailerons but wires and pulleys that twisted the woodandcanvas wings, to control the plane, Scientists have long sought to develop aircrafts that can alter their wings during flight, just as birds can. However, most previous attempts have failed because they relied on heavy mechanical control structures within the wings. These structures were also plex and unreliable, said Neil Gershenfeld, a physicist and director of the Center for Bits and Atoms at Massachusetts Institute of Technology (MIT). The new wing consists of a system of tiny, strong, lightweight modules. The shape of the wing can be changed uniformly along its length using two small motors, which apply a twisting pressure to each wingtip. These wings are covered in “skins” of overlapping strips of flexible material resembling fish sizes. These strips move across each other as the wings alter, providing a smooth outer surface, the researchers explained. Windtunnel tests of these wings showed that they at least matched the aerodynamic properties of conventional wings, at about onetenth the weight. Initial tests using remotely piloted aircrafts made with these wings have shown great promise, said Benjamin Jet, a graduate student at the Center for Bits and Atoms at MIT. The new modular structures the scientists developed could be manufactured quickly in mass quantities and then installed by teams of small robots. These modular structures also can be disassembled more easily, making repairs simpler. “Still , the first aircraft built using this strategy will not be a passenger jet, ”Gershenfeld said. “Instead , the technology will likely first be tested on unmanned aircraft, leading to drones (無(wú)人機(jī) ) that can fly for a long time, to help deliver inter access or medicine to remote villages and do some rescue works.” 32. Why did most previous aircrafts fail to fly like birds? A. The previous wings were plicated and weighed a lot. B. The previous aircraft relied on ailerons to control directions. C. There were few scientists to do research on the lighter wings. D. There was little fuel in the aircrafts to make them fly in the air. 33. What is the fourth paragraph mainly about? A. The shape of the new wings. B. The result of the tested wings. C. The function of the small motors. D. The working principle of the new wings. 34. Which of the following can replace the underlined word“disassembled”in Paragraph 6? A. put away B. taken apart C. invented D. analyzed 35. What will the drones made by the new wings be firs