题目

Last year I went to America and stayed there with an American family for two months. As is said, “The best house is in America, the best wife is in Japan, and the best food is in China.” So I  41   pride and pleasure to  42  “the best food” for my American family. Each day, regardless of my poor skill of cooking, I would do something in a  43   way: changing the dishes color, the meat’s type or the soup’s style. Thus, my American friends could discover the  44   of eating Chinese food. Because of my “  45  ” job, I was often rewarded by their  46  of thank科学家用显微技术除去变形虫的细胞核，其新陈代谢减弱，运动停止；重新植入细胞核后，发现其生命活动又能恢复。这说明了细胞核是A．细胞代谢的主要场所B．遗传物质的储存和复制场所C．细胞遗传特性的控制中心D．细胞生命活动的控制中心