历史上贝壳、牲畜、布匹等都曾充当过商品交换的媒介,但随着商品交换的发展,“贵金属”长期占据货币的宝座。下面对此认识正确的是（  ）

①“贵金属”是充当一般等价物的唯一商品　②货币是商品交换发展到一定历史阶段的产物　③“贵金属”固定地充当一般等价物时,货币产生　④所有充当过商品交换媒介的商品都是货币的替代物

根据短文内容，请将单词填写在题号对应的横线上。

    Most people nowadays are so busy with their lives that they do not have time to enjoy a healthy and ____ (balance) diet. For most individuals, as ____ result of eating foods rich in fats and sugar several years, they choose to go on a diet but do not succeed at the end. Be sure to be with a strong ____ (aware) that you are ____ you eat! Therefore, maintaining a healthy diet not only ____ (provide) your body with energy but also numerous health benefits. One is that you will keep a healthy weight and is also the easiest and most ____ (benefit) way in which you can be energetic and protect yourself ____ a number of diseases when growing old. Another benefit is that you will meet your everyday nutritional ____ (require). ____ (basic) speaking, you should ensure that you take the good amount of vegetables, grains, milk and proteins. In most cases, a healthy diet can help you decrease the risk of ____ (get) some diseases like diabetes and cancer.