5．In the eyes of Ainsworth, his company's technology ________.

　　A．will solve the problem of air pollution

　　B．can be convenient and powerful to use

　　C．will change how people explore the ocean

　　D．can deal with the shortage of water worldwide

　　解析：选B　推理判断题。根据文章第二段中的"He said the technology was easy to fix and maintain, meaning it could be used in deep water, on floating structures far from shore. 'If we do that, it opens up a global deep water offshore wind market，' he said."可知，这项技术易于安装和维护，如果真的那么做，这会开拓出一个新市场。由此可知，安斯沃思认为这项技术便于使用且效能很高。故选B项。

　　6．The underlined phrase "a silver bullet" probably means that using this technology to meet our needs is not ________.

　　A．scientific B．complicated

　　C．simple D．traditional

　　解析：选C　词义猜测题。根据文章最后一段中的"welcomed the technology"可知，英国可再生能源协会表示欢迎这项新技术，but表转折，再结合该组织的副首席执行官玛夫·史密斯所说的话"Kite power is at an early stage of development and it will take time to see how the technology progresses."可知，风筝发电尚处于早期，看到这项技术如何进展还需很长一段时间。由此可推测，was not a silver bullet在此表示要想运用这项技术解决我们对能源的需求问题并不是一件简单的事情。故选C项。

　　7．What is the author's purpose in writing the text?

　　A．To argue for cleaner energies.

　　B．To inform a new way to get energy.

　　C．To advertise a great energy company.

　　D．To compare different energy resources.

　　解析：选B　写作目的题。本文主要介绍了风筝发电技术的优势、发展及前景等，其目的主要是向读者介绍一种获取能源的新方式。故选B项。

　　C

　　240 BC: Greek astronomer, geographer, mathematician and librarian Eratosthenes worked out the Earth's circumference (the distance around it). His data was rough, but he wasn't far off.

　　Eratosthenes was an all­around man. Some people then called him Pentathalos, a champion of many skills. His rich knowledge made him a natural for the post of librarian of the library of Alexandria, Egypt, the greatest repository of classical knowledge.

Eratosthenes knew that at noon on the day of the summer solstice, the sun was observed to be directly overhead at Syene (modern­day Aswan): You could see it from the bottom of a deep well, and a sundial (日晷) left no shadow. Yet, to the north at Alexandria, a sundial left a shadow even at the solstice midday, because the sun was not directly overhead there. Therefore, the Earth must be round - already firmly