materials that really work"可知，高质量的教材是剑桥英语的优势之一。

　　2．Cambridge English can help students become confident about Cambridge English exams because________.

　　A．the exams are written by its teachers

　　B．it works together with the exam authority

　　C．it is guided by language assessment experts

　　D．its materials are provided by official examiners

　　解析：选B　细节理解题。根据第四段中的"Our wide selection of courses, practice tests and materials are developed in close cooperation with Cambridge English Language Assessment, the people who set the exams"可知，剑桥英语和剑桥大学外语考试部有着紧密的合作关系，因此能很好地帮助学生为考试作好准备。

　　3．What type of writing is this text?

　　A．A guide.　　　　　　 B．A report.

　　C．An announcement. D．An advertisement.

　　解析：选D　文章出处题。通读全文可知，本文主要介绍了剑桥英语的优势，包括其高质量的教材、教授实用地道的语言、与剑桥大学外语考试部的合作及对老师自我提升的帮助，其目的是吸引人们参与其课程。由此可推测，本文是一则广告。

　　B

　　David was about 8 when he learned how to swim. He got so good that he eventually picked up free diving, a sport where divers hold their breath until resurfacing instead of using breathing equipment. He never imagined nearly two decades later he would come to use that skill in such a way.

　　It is an extraordinary act of courage, but to have the moment caught on camera for the world to see is something else entirely. The scene was filmed by someone on the same boat and was put online. The video was shared immediately by national and global media.

　　That August day began with David boating around with his friends. They spotted a woman driving a bright red Mazda heading right into high water. David and his crew tried to warn her to stop, but by then it was too late, and the car had already slid under water.

　　In the moments before David jumped into those muddy flood waters to tear the roof off the car with his bare hands, his thought process was short. In fact, he didn't have one.

　　"The car was sinking fast，" David says. "There was no time to think. It had to be done."

　　Up until recently, David hadn't reunited with the woman he saved. He was perfectly fine with saving a stranger and remaining unknown to her.

Still to this day, even after the attention the video received, after the media from all over the