题目

How green are you? Do you know how to be green? We all need a healthy environment, but we produce waste every day and it does harm to our environment. Though we are young, we can still do something to help. In fact, even the simplest everyday activities can make a real difference to the environment. Here are some ideas for you. Reduce Reduce means “use less”. Don’t waste things. This saves money and reduces pollution and waste going into the environment. Before we buy something new, think whether it is really necessary—or maybe the old one will be just as good! When we do buy 国际互联网上曾经报道“世界上有近20亿人患有缺铁性贫血”．这里的“铁”是指（ ）A．铁单质B．铁元素C．四氧化三铁D．三氧化二铁