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新能源的开发和应用是人类社会的当务之急．核电站的核心设备是核反应堆，核反应堆中发生的是核______；我们今天所用大部分能量都来源于______能．

答案

核能发电是利用铀原子核裂变时放出的核能来发电的．

世界万物的生长离不开太阳，可以说地球上的能量主要来源于太阳．

故答案为：裂变，太阳．

单项选择题

下列不属于肽类激素的是

A．胰岛素原

B．胃泌素

C．抗利尿激素

D．皮质醇

E．促甲状腺素
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What is distance learning It means that you study on your own, at home or wherever suits you. Recently, the world famous Open University in the United Kingdom has designed a new style of distance learning, which is called (1) . The phrase "Open Learning" means you study (2) . You read course material, work on course activities, and write (3) . The word "Supported" means you have help (4) , the student services staff at regional centres, and centralized areas such as (5) . You can also contact other students through tutorials and (6) , the University’s online conferencing system, and events and clubs organized by (7) . Most distance learning courses use printed paper materials. They also include some (8) materials such as a CD, DVD or video. Many courses have a web site and an (9) . You’ll need access to a computer (10) to make use of these. The Open University can help its students buy a computer and (11) the cost of accessing the Internet.

With most distance learning courses, no (12) are required to study. of course, you have to be aged 18 when your course starts but there is no (13) . Currently the Open University has around (14) undergraduate and more than 30,000 postgraduate students, of which 10,000 have (15) . Nearly all students are studying (16) . About 70 per cent of undergraduate students are in (17) . More than 50,000 students (18) by their employers for their studies. Most distance learning courses (19) . Some of them are even available in other parts of the world. With over 25,000 of its students living outside the UK, the Open University is the (20) that offers distance learning throughout the world.

3（）
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