世纪末16世纪初, 哥伦布等西方航海家的探险活动, 使欧洲与东方的交往日益密切，世界逐渐融为一体的历史事件是(     )

    Natural resources are things that we use that come from the earth. Our natural resources are limited(有限的). This means that they will not1forever. Some are renewable, like when you plant a new tree when you cut one down. Others are not renewable, like when you dig coal(煤) out of the 2Once it is used, it is gone.

    People realize the 3 that the earth's natural resources are limited, and can do things to help conserve(节约) those resources.4you try to conserve a natural resource, you try to use less of it, so it does not get used up so5One way that people conserve fuel, like gasoline, is by riding a bicycle or walking when the6is short instead of driving everywhere.

    Water is a very important natural resource because we all need it to stay 7We can conserve water8making sure that our pipes and taps do not leak(泄露). We can also make wise choices to conserve water, like only using the dishwasher or washing machine when they are full. Everyone can make contributions to protecting natural resources.

在一定条件下，测得2CO₂2CO+O₂(反应从CO₂开始)平衡体系的平均相对分子质量为M，在此条件下，CO₂的分解率为

材料一：2014年我国国民经济的主要统计数据（下图）

注：2014年城镇常住人口74916万人，比上年增加1805万人；城市居民收入增长6.8%，农村居民增长9.2%

材料二：党的十八届四中全会提出，要更好的统筹社会力量、平衡社会利益、调节社会关系、规范社会行为，必须更好发挥法治的引领和规范作用，一定意义上说，社会主义市场经济本质上是法治经济，法治是建立现代市场经济的重要基石，完备的法律制度和法治理念是市场良好运作的前提。使市场在资源配置中起决定性作用和更好发挥政府作用，必须以保护产权、维护契约、统一市场、平等交换、公平竞争、有效监管为基本导向，完善社会主义市场经济法律制度。