1.More and 90 percent of the calcium in the human body is in the skeleton.





2.Perhaps the most popular film in movie history, Star Wars was written and direction by George Lucas.





3.Some animal activities, such as mating, migration, and hibernate , have a yearly cycle.





4.Geographers were once concerned largely with exploring areas unknown to them and from describing distinctive features of individual places .





5.In his animated films, Walt Disney created animals that talk and act like people while retaining its animal traits.





6.The first city in the United States that put into effect major plan for the clustering of government buildings was Washington, D.C.





7.In a microwave oven, radiation penetrates food and is then absorbed primarily by water molecules, caused heat to spread through the food .





8.The cultures early of the genus Homo were generally distinguished by regular use of stone tools and by a hunting and gathering economy .





9.Dolphins are sleek and powerful swimmers that found in all seas and unlike porpoises have well defined, beaklike snouts and conical teeth .





10.The velocity of a river is controlled by the slope , the depth, and the tough of the riverbed.