B. He developed a chemical battery.

　　C. He is working on a nuclear energy source.

　　D. He made a breakthrough in computer engineering.

　　61. Jae Kwon gave examples in Paragraph 4_________.

　　A. to show chemical batteries are widely applied.

　　B. to introduce nuclear batteries can be safely used.

　　C. to describe a nuclear-powered system.

　　D. to introduce various energy sources.

　　C

　　If you’d like to go sightseeing, the following World Heritage Sites may be your best choices.

　　Jiuzhaigou Valley Scenic and Historic Interest Area

　　The Jiuzhaigou Valley, which lies in the northern part of Sichuan Province, reaches a height of more than 4,800 meters, with a series of different forest ecosystems（生态系统）. There you can enjoy watching excellent waterfalls. Some 140 kinds of birds also live in the valley, as well as a number of endangered plants and animals, including the giant panda. For more information, please visit http://whc.unesco.org/en/list/637.

　　Khami Ruins National Monument

　　The city of Khami, which developed after the capital of Great Zimbabwe had been given up in the mid-16th century, is of great archaeological（考古的）interest. The discovery of objects from Europe and China shows that Khami was a major centre for trade over a long period of time. For more information, please visit http://whc.unesco.org/en/list/365.

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