明代徐宏祖著《徐霞客游记》，他是世界上对______

明代徐宏祖著《徐霞客游记》，他是世界上对_______进行研究的人。

查看答案

正确答案：

答案解析：

上一题下一题

你可能感兴趣的试题

从1980年起，每年举办国际风筝节的城市是()。

A、北京
B、天津
C、江苏南通
D、山东潍坊

查看答案

北京人在人际交往中的禁忌有（）。

A、壶嘴对着客人
B、单手递烟、酒、茶
C、待客顿饭吃饺子
D、请客不给客人敬酒而自饮
E、借药锅不主动送还

查看答案

冬虫夏草是青海和西藏地区特有的土特产品。

查看答案

中国古代园林中理水的方法一般有以下三种：掩、隔、________。

查看答案

名酒五粮液、古井贡酒和董酒均产于四川。

查看答案

热门试题更多>

意外事故发生后的()与()行为属于预警行为。
所有心肌细胞共同具有的生理特性是_________和_________。
健康促进的生活领域包括：指定能促进健康的公共政策、()、()、发展个人技能和调整卫生服务方向。
浮点数下溢处理的精度损失对______ 程序和_______ 程序设计者都是透明的。
在DNS系统中，有______和迭代查询两种模式。
Without transportation, there could be no trade. Without trade, there could be no towns and cities. Towns and cities are traditionally the ___16___ of civilization. Therefore, transportation helps make civilization ___17___ . Throughout most of the prehistoric period, people lived by hunting, fishing, and ___18___ wild plants. They had no beasts of burden, wheeled vehicles, or roads. People traveled ___19___ and carried their infants and belongings strapped to their backs or heads. Loads too heavy for one person to carry were strapped to a pole and carried by two people. ___20___ , people learned that they could drag loads along the ground on sledges. During late prehistoric times, people began to build sledges with runners. When people developed agriculture and began to establish ___21___ settlements, trade between settlements started to develop, which created a need for better ___22___ of transportation. The donkey and the ox, which had been tamed for food products and farm work, helped ___23___ this need. The use of donkeys and oxen as beasts of burden enabled people to ___24___ heavier loads than they could before. People also began to develop water transportation during prehistoric times. They built rafts of such __25____ as logs or reeds. Later, people learned ___26___ to make dugouts and canoes. People paddled these early craft with their hands or propelled them with paddles or __27____. The wheel was invented about 3500 B.C. and sailboat about 3200 B.C. Wheeled vehicles and sailing vessels ___28___transportation. But the speed of transportation improved only ___29___ over the centuries. Inventors produced the first engine- ___30___ vehicles during the late 1700’ s and the early 1800’ s. This development marked the beginning of a revolution in transportation that has continued to the present. 16. A. highlights B. pinpoints C. headquarters D. centers 17. A. possible B. acceptable C. practical D. typical 18. A. growing B. gathering C. watering D. moving 19. A. in turn B. at ease C. on foot D. for fun 20. A. All the while B. For a while C. In time D. On time 21. A. temporary B. permanent C. regular D. steady 22 A. knowledge B. judgment C. standards D. means 23. A. recognize B. develop C. meet D. reduce 24. A. bear B. move C. share D. lift 25. A. materials B. styles C. items D. types 26. A. where B. when C. how D. as 27. A. poles B. sails C. currents D. winds 28. A. demonstrated B. revolutionized C. witnessed D. initiated 29. A. considerably B. continuously C. swiftly D. slightly 30. A. powered B. controlled C. oriented D. related
设T为根树，若________，则称T为m元树;若________则称T为完全m叉树。
设X{1,2,3,4},R{1,2,2,4，3,3}，则r(R)=________;s(R)=________;t(R)=________。
健康行为包括健康促进行为和健康 _______行为。
CSS语法由______、属性和值三部分构成。