不可思议！丹麦一无链自行车亮相，99%力转化！

Dealing with an oily bicycle chain is never fun, especially for cyclists wanting to ride on the open road during the hot summer. Cyclists need not be disappointed any longer, as engineers have come up with a design that could send the chain to the history books.
Danish-based company CeramicSpeed, has showed a revolutionary bike that uses a new type of drivetrain to take power from the pedals to the back wheel. It is claimed that the system creates almost 50 per cent less friction than the most efficient conventional bikes, making it far easier to pedal. The system, called Driven, is one of a series of developments in recent years intended to find an alternative to the traditional chain.
The company insisted that its chainless system is the most efficient to be seen in the industry. The technology, which has been developed in a deal with the mechanical engineering department at the University of Colorado, was introduced at a recent trade show. It uses a pedal to turn a horizontal shaft containing 21 bearings which in turn powers the back wheel.The Driven drivetrain has no chain, making it more than 99 per cent efficient. This means almost none of the power is lost.
The move towards a chainless bike is seen as a worthy goal for bike companies, given the problems many cyclists have with chains. Chains require some oil and cleaning to perform well and also need replacing sometimes.
Sam Jones, senior officer at Cycling UK, said, “I'm sceptical about the efficiency claims of this bike. Shaft-drive bikes have been around for over a century and never taken off because they've always been much less efficient than chain drives. They're more expensive too, because a new frame design is required.” 

        本时文内容由奇速英语国际教育研究院原创编写，未经书面授权，禁止复制和任何商业用途，版权所有，侵权必究！（投稿及合作联系：028-84400718   QQ：757722345）

1.What will disappoint the cyclists in the hot summer?

A The history books.

B The strange design.

C The oily bicycle chain.

D The open road.

解析：选C。细节理解题。根据第一段第一句Dealing with an oily bicycle chain is never fun, especially for cyclists wanting to ride on the open road during the hot summer. 可知是油腻的车链子让骑自行车的人失望。故选C。

2.What is the advantage of Driven?

A Its traditional design.

B Its fast speed.

C Its high efficiency.

D Its solid frame.

解析：选C。细节理解题。根据第三段第一句The company insisted that its chainless system is the most efficient to be seen in the industry. 和第四句The Driven drivetrain has no chain, making it more than 99 per cent efficient. 可知这种自行车是极其高效的。故选C。

3.What is used for powering the back wheel in the Driven?

A The horizontal shaft.

B The pedals.

C The brakes.

D The chain.

解析：选A。细节理解题。根据第三段第三句It uses a pedal to turn a horizontal shaft containing 21 bearings which in turn powers the back wheel.可知该系统是通过一个含有21根轴承的水平轴来驱动后轮的。故选A。

4.What did Sam Jones think of the new bike?

A It was a worthy goal.

B It would not become popular.

C It saved much money.

D It could take off in a short time.

解析：选B。推理判断题。根据最后一段Sam Jones说的话可知他怀疑这种自行车的优点。他认为这种车没有有链自行车高效，而且昂贵，因此不会受人欢迎。故选B。