A. They want to return to nature. B. They want to eat all kinds of foods. C. Natural foods are very delicious. D. They are more health conscious. 参考答案:D 答案解析:[命题目的] 本题考查对文章细节的理解。 [解题要点] 根据题意,确定答案在第一段第一句话“people...become aware of the need to change their e
第33题: [单项选择]隔离开关的主要作用是()。 A. 断开负荷电路 B. 断开无负荷电路 C. 断开短路电路 D. 断开过载电路 参考答案:B