题目

任务型阅读;阅读下列短文，根据短文信息完成文后表格，每空一词。 This week, our topic is pollution. What are the answers to all of our pollution problems? We asked two experts to give their views. ◇Forest Smith is a member of Green First, an environmental group. Our future on the Earth looks very bad. We are dumping waste on our land. We can’t breathe the fresh air. The sea is polluted too. I visited some relatives recently in a small village. They grow their own food and cycle everywhere. They are not wealthy, but they are happy and healthy. We must close t下列关于力的说法正确的是（  ）A．重力的方向在赤道上和南北两极是不一样的，所以重力的方向不一定就是竖直向下B．物体的重心一定在物体上C．木块放在桌面上处于静止状态，桌面受到木块的压力是由于桌面发生弹性形变的缘故D．接触面间的弹力的方向总是垂直于接触面