题目

 ______________ I try to make time to go out and have fun, my grades _________.A. For the first time; trap                 B. The first time; countC. Every time when; worsen              D. Every time; suffer 答案：D无酒窝由显性基因B控制，有酒窝由隐性基因b控制，一对夫妇的基因型都为Bb，他们的孩子可能是（ ）A．全部无酒窝 B．全部有酒窝C．部分无酒窝、部分有酒窝 D．以上都有可能