参考答案

正确答案：C
解析：推断题。本题问的是：新鲜蔬菜和水果______。依据文章第1段最后两句“The vitamins necessary for a healthy body are normally supplied by a good mixed diet，including a variety of fruit and green vegetables．It is only when people try to live a very restricted diet，say during extended periods of religious fasting，or when trying to lose weight，that it is necessary to make special provision to supply the missing vitamins”可知，健康身体所需的维生素包含在各种蔬菜和水果当中，除非有特殊情况，人们不需要再额外补充维生素了。因此，我们可以推断出蔬菜和水果里面包含了人体所需的所有维生素，可见选项C 为正确答案。