Academic (学院部) Information 490. English Composition. Fall, Spring, 3 hours. One lecture, two writing laboratories. Pre-requirement: English 400 or permission of the instructor. A review of English grammar and vocabulary, practice in writing technical English. Intended to assist foreign graduate students to write theses. Not open to native speakers. Professor Baker. Satellite (卫星) The most powerful carrier of information ever created isn’t a highway at all it’s a super skyway. And it exists today—a satellite network that is ubiquitous (普遍存在的), reliable and efficient. Unlike fiber optics (纤维光学), satellites can send data to any point on earth, at sea or in the air—all at the same time. Nor are they as vulnerable (易受伤的) to great natural disasters like flood and earthquakes. Satellites are essential for today’s broadcast, cable, business, TV, radio, data delivery, educational programming and telephone industries. In the first ad, (46) will instruct this course. This course seems to be open to (47) . According to the advertisement, (48) is the most powerful carrier of information. Satellite can (49) at the same time. (50) can not affect the satellite’s functions (功能).