题目

       One reaction to all the concern about tropical deforestation (砍伐森林) is a blank stare that asks the question, Since I don't live there, what does it have to do with me?        The answer is that your way of life, wherever you live in the world, is tied to the tropics (热带地区) in many ways. If you live in a house, wash your hair, eat fruits and vegetables, drink soda, or drive a car, you can be certain that you are affected by the loss of tropical forests.        Biologically, we are losing the richest regions on earth when, each minute, a piece of 为检验某化合物是否是由碳、氢、氧三种元素组成，取一定质量的该化合物在氧气中充分燃烧后，还需要进行的实验是（ ）①用带火星的木条检验O2②用无水硫酸铜检验H2O③用澄清石灰水检验CO2④测定生成物的质量．A．①②③④B．①②③C．②③④D．②③