题目

阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。 There are two primarily choices in life: to accept conditions they exist, or accept responsibility for changing them. Many people are (constant) waiting for their life to start. They always say, “When I am older I will do this.” “In a few years, I will do that.” They think the life they (experience) is boring and (mean). Who has never viewed himself or herself as worthless and unattractive? All of us may suffer (depress) and frustration, lose guidance and support, and need aids 在红枣和菠菜等食物中含有丰富的铁，这里的铁应理解为 [     ]A．单质 B．分子 C．元素 D．同位素