题目

The food we eat seems to have a great effect on our health. Although science has made big steps in making food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research has shown that perhaps eighty percent of human illness is related to food and forty percent of cancer is related to food as well. That food is related to illness is not a new discovery. In 1945, some researchers realized that things commonly used to keep colour in meats and other food additives（添加剂）caused cancer. Yet, these additives remain in our food, and it is difficult to know which th 阅读下列材料： 　　材料一：秦汉以来，官员的选拔主要采用推举的方式，在汉代，推举的对象多是公卿或郡县的属吏，或者是儒生和有德行的处士。魏晋以后，选举之权更是逐渐被地方上的士族门阀所把持，庶族子弟多受排挤。 　　材料二：科举取士不重家世门第，一律取决于考试，意在为大批庶族人才的参政广开门路。科举制度实行后，用人之权收归中央，并扩大了政治统治的基础。 请回答： （1）材料二反映的社会现象开始于哪一朝代？ （2）秦汉与材料二所反映的历史时期的官员选拔方式有哪些不同点？ （3）联系现实生活，你认为推举与考试，哪一种方式更容易得人才，更能体现公平竞争的精神？