“污水指数”是水质评价的常用指标，“污水指数”越高，说明水污染越严重，水质越差读下图，回答问题。

描述珠江口水域水污染时空分布规律并从人类活动角度阐述提高珠江入海口水质的措施。

    During the day, you spend a lot of time running, jumping, laughing, eating, and talking. You use up a lot of energy(能量), and by the end of the day you're tired. Sleep gives your body a chance to rest.

    But your brain (大脑) and body are not completely at rest during sleep. While you sleep, your mind may think of the things that happened during the day. It keeps the important things in mind as memories(记忆). It also thinks about things you were worrying about, and you may wake up with answers to some of your problems.

    You also grow while you sleep. The thing called "human growth hormone (荷尔蒙)" in the body helps you grow during sleep. This growth hormone also helps the body to repair itself.

    Sleep helps your body to conserve energy too. You use up a lot of energy during your daily activities. But when you sleep, your body temperature falls, and your "metabolism" (新陈代谢) slows down. You are still using some energy, but much less than when you are awake and active.

    Have you ever stayed up past your bedtime? Did you have difficulty getting up the next morning? Maybe you had problems seeing clearly or you cannot think clearly. That was your body's way of saying, "I need sleep!" A lack ( 缺乏) of sleep can stop your body and mind from working correctly.

我国大力推进城乡社区建设，构建基层社会管理和服务平台。截止2011年底，全国共建成社区服务中心1.4万个、社区服务站4.9万个、其他社区服务设施8.5万个，全国社区 志愿者组织达28.9 万个。社区建设的实践表明（    ）

①推进城乡社区建设是实现基层群众自治的重要途径

②提供社区公共服务是构建基层社会管理平台的主要目标

③构建基层社会管理平台是完善政府行政管理体制的创新

④构建基层社会管理平台是完善政府行政管理体制的创新

“往年的南泥湾，到处是荒山，是呀荒山……”《南泥湾》以优美热情的旋律,描绘了陕北江南的美景,礼赞了劳动模范的功勋。那么，改变革命中南泥湾荒山现状的部队是(    )