题目

阅读下面短文，从方框中所给的A~D四个选项中选择正确的答案，使短文意思连贯，然后回答问题。 （1） 选择正确的答案。Family Traditions What are your family traditions? Thefollowing information comes from several readers: JARED: We take turns picking a movie to watch together. It's fun because Iwatch something my parents like, and they watch something I like. My motherlikes old black and white movies, so I see a lot of them! We also make pizzaand eat it in front of the TV. WINNIE: My favorite meal is spaghetti and meatballs. My mom usually coo3、在肺炎双球菌转化实验中，将加热杀死的S型细菌与R型活细菌混合并注射到小鼠体内后，在小鼠体内S型和R型细菌含量变化情况如下图所示。有关叙述错误的是 A．死亡小鼠体内存在S型和R型两种细菌 B．S型和R型细菌在小鼠体内均可作为抗原物质 C．曲线ab段下降是由于R型细菌被小鼠免疫系统大量消灭 D．S型细菌的遗传物是DAN，R型细菌的遗传物质则不是