题目

“种瓜得瓜，种豆得豆”，在生物学上被称为遗传现象，对此起主要作用的物质存在于（  ）A. 营养物质      B. 遗传物质        C. 细胞质        D. 细胞核  答案：D解析:略 —What are you doing there?   —I am tasting the soup. It ______ wonderful.   [     ]A. tastes           B. tasted               C. is tasting              D. is tasted