题目内容
The picture _______ on the wall is painted by my nephew.
A. having hung B. hanging
C. hangs D. being hung
B
暑假作业暑假快乐练西安出版社系列答案As motorways become more and more blocked up with traffic, a new generation on flying cars will be needed to ferry people along skyways. That is the conclusion of engineers from the US space agency and aeronautical firms, who envision future commuters traveling by “skycar”.
These could look much like the concept skycar shown in the picture, designed by Boeing research and development. However, such vehicles could be some 25 years from appearing on the market. Efforts to build flying vehicles in the past have not been very successful. Such vehicles would not only be expensive and require the skills of a trained pilot to fly, but there are significant engineering challenges involved in developing them. “When you try to combine them you get the worst of both worlds: a very heavy, slow, expensive vehicle that’s hard to use,” said Mark Moore, head of the personal air vehicle(PAV) division of the vehicle systems program at Nasa’s Langley Research Center in Hampton, US. But Boeing is also considering how to police the airways-and prevent total pandemonium(吵杂狂乱的喧闹)-if thousands of flying cars enter the skies.
“The neat, gee-whiz part is thinking about what the vehicle itself would look like,” said Dick Paul, a vice president with Phantom Works, Boeing’s research and development arm. “But we’re trying to think through all the consequences of what it would take to deploy(散开) a fleet of these.”
Past proposals to solve this problem have included artificial intelligence systems to prevent collisions between air traffic. Nasa is working on flying vehicles with the initial goal of transforming small plane travel. Small planes are generally costly, loud, and require months of training and lots of money to operate, making flying to work impractical for most people. But within five years, Nasa researchers hope to develop technology for a small plane that can fly out of regional airports, costs less than $100,000(£55,725), is as quiet as a motorcycle and as simple to operate as a car.
Although it would not have any road-driving capabilities, it would bring this form of travel within the grasp of a wider section of people. The new technology would automate many of the pilot’s functions. This Small Aircraft Transportation System(Sats) would divert pressure away from the “hub-and-spoke(中心辐射型)” model of air travel. Hub-and-spoke refers to the typically US model of passengers being processed through large “hub” airports and then on to secondary flights to “spoke” airports near their final destinations.
【小题1】The best title for this text would be .
| A．Developing Skycars | B．The Traffic Jams in the Sky |
| C．How to Guide Flying Cars in the Sky | D．What Flying Cars Will Look Like |
| A．see | B．expect | C．think | D．announce |
| A．how to fly out of regional airports |
| B．how to prevent the disorder of the airways |
| C．how to reduce expenses and the vehicle’s weight |
| D．how to fly the skycars to enter skies |
| A．make big flying cars |
| B．work out the plan——how to transform small plane travel |
| C．develop a new kind of small plane different from the traditional one |
| D．build a new kind of small plane with road-driving abilities |
阅读下面短文和问题，根据短文内容，在相应题号后的横线上写下相关信息(不多于
五个单词)，完成对该问题的回答。答语要结构正确，书写工整，字迹清楚。
 1. Cousins You could say that the alligator and the crocodile are cousins because they belong to the same animal group. The group is called Archosauria (ark-o-SOR-ee-ah). The name means "ruling lizards." The alligator and the crocodile are alike in many ways. Both have hard, bumpy skin. Both lay eggs in nests that they build near water. Both are reptiles (爬行动物), too.  2. Look Again Even though alligators and crocodiles are similar, there are ways to tell them apart. Adult alligators are usually gray or black, and they are darker than crocodiles. Adult crocodiles may be tan, green, or brown. Most types of alligators have broad snouts. Crocodiles' snouts are different. Their snouts are long and narrow. Look at the picture of the alligator. Whenever an alligator closes its mouth, only the top teeth show. Now look at the picture of the crocodile. Do you see a difference? Whenever a crocodile closes its mouth, some of the lower teeth also show.  3 Alligators and crocodile also have different ways of doing things. Alligators like freshwater. They sometimes wander into salty seawater, but they don't stay in the water very long. The salt can be bad for them. Alligators usually make their nests at the edge of freshwater lakes, rivers, or swamps. They use grass and leaves to make their nests. Crocodiles, on the other hand, usually build their nests in mud or sand. Sometimes they construct these nests near salty water. The salty water doesn't hurt them. Alligators and crocodiles do other things differently, too. A mother alligator stays near her nest. When the eggs hatch, she carries the babies to water. They may even ride around on her head as she swims. They depend on her to help them stay safe. Crocodile babies don't rely as much on their mothers. In fact, the babies leave the nest a few days after they are born. |
【小题2】According to Part 2 "Look Again", how can we tell alligators and crocodiles apart?
【小题3】What might be a suitable heading for Part 3?
【小题4】According to the passage, who rely more on their mothers?
【小题5】Who is the passage most likely intended for?