遗传物质是一种叫DNA的有机物，DNA主要存在于( )
在一株开红花的菊花上，嫁接了一枝开黄花的菊花枝条，待到该株菊花开花时，新接上的枝条上的花为（ ）
— _____ inventor. The inventor is very great.
— ______ is the Changjiang River in China, do you know?— Yes, it's about 6,380 kilometers long.
