15°的弧度是（　　）

2013年6月11日，我国成功发射了第五艘航天载人飞船——神州十号。这次航天飞行的亮点之一是女航天员王亚平为地面的青少年进行我国首次太空授课，开辟了我国太空教育的新篇章。太空授课北京时间6月20日10时04分至10时55分，王亚平展示了微重力条件下的特殊物理现象，加深青少年对液体表面张力的作用、对质量、重量以及牛顿定律等基本物理概念的理解。在观看“太空授课”过程中，苏阳发现电视信号出现了一段时间的中断，请你分析其原因可能是受（     ）

Brownie and Spotty were neighbor dogs. They loved each other and played together so often that they had worn a path through the grass of the field between their houses.
One evening, Brownie's family noticed that their dog hadn't returned home. They went looking for him, but with no success. Brownie didn't show up the next day, and by the next week he was still missing.
Curiously, Spotty showed up at Brownie's house alone. He barked loudly. But busy with their own lives, Brownie's family just ignored (忽略) their neighbor's nervous little dog.
Finally, one morning Spotty refused to take "no" for an answer. He followed Ted, Brownie's owner, everywhere he went. He barked, then rushed towards a nearby empty lot and back, as if to say, " Follow me!"
Finally, Ted followed the dog across the empty lot. The dog led the man to a tree a half-mile from the house. There Ted found Brownie alive. One of his legs was crushed (夹住) in a trap. Ted wished he had taken Spotty's earlier appeals (求助) seriously.
Then Ted noticed something amazing. In a circle around the injured dog, he saw a lot of dog food. They were the remains of lots of meals.
Spotty had been visiting Brownie every day. He had stayed with Brownie to protect him, snuggling(依偎) with him at night to keep him warm and nuzzling(用鼻子爱抚) him to keep his spirits up.

材料一：高原适于畜牧，行族长政治，不能形成巩固的国家，无文明可言；平原土地丰饶，始有农业，行封建政治，有巩固的国体，文明灿然；海滨交通便利，能激发冒险进取之心和向往自由之精神。（注：非洲为高原之地，亚洲为高原、平原交错之地，欧洲为高原、平原、海滨三者调和适均之地。）

——梁启超《地理与文明之关系》（1902年）

材料二：英国是现代资产阶级政治制度的发源地早已为世人所公认。即使在当今社会主义国家的某些机构或制度上，也隐隐约约地打着英国影响的印记。因此，要了解当代西方政治制度乃至现代人类政治文明的来龙去脉，首先必须了解英国政治制度及其历史。

——程汉大《英国政治制度史》

我国宪法规定，全国人民代表大会和地方各级人民代表大会都由民主选举产生，对人民负责，受人民监督。国家行政机关、审判机关、检察机关都由人民代表大会产生，对它负责，受它监督。人大监督是代表国家和人民进行的具有法律效力的监督，是不可替代的。