体育运动中，科研人员经常利用频闪摄影对运动员的动作进行分析与指导．频闪摄影就是摄影光源在有节奏的闪光时，从光源射出的光线照射到运动员身上发生______，又通过摄影机前的______镜形成______像．观察图中照片，可知频闪摄影时要求背景较______（填“亮”、“暗”）．
频闪摄影就是摄影光源在有节奏的闪光时，从光源射出的光线照射到运动员身上发生漫反射，因为人穿的衣服的表面粗糙不平．
人反射的光线通过摄影机成倒立、缩小的实像，频闪时要求背景较暗，如果背景较亮，看到的人的图象就不清晰．
故答案为：漫反射，倒立，缩小，实，暗．
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| 1. The Eiffel Tower is _____ high. | ||||
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| A. 247 meters B. 270 meters C. 320 meters D. 343 meters | ||||
| 2. Big Comics Superior is _____. | ||||
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| A. a football player B. a Japanese magazine C. a beautiful city D. an English film | ||||
| 3. Where did the Year of Einstein start? | ||||
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| A. In Germany. B. In America. C. In England. D. In France. | ||||
| 4. How long did Lien Chan stay in the mainland? | ||||
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| A. For three days. B. For eighty days. C. For five days. D. For eight days. | ||||
| 5. The four passages are probably from _____. | ||||
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| A. instructions B. newspapers C. advertisements D. dictionaries |