题目

完形填空Growingup in the 1960s, I was taught from an early age to send a handwritten thank­younote expressing 1for kindness. My mother used to buy me abox of paper and 2 me in the art and value of saying thankyou. She 3to be right.A study showed thatit took less than 5 minutes to write the thank­you notes. Just 5 minutes tomake 4 person feel overjoyed! 5 ， in our instant world, the idea of getting an actual penand writing an actual note seems to never come to mind. We tend to do what is 6 forus — a quick text or an email.It's easy to usethe7of being busy, but even very busy and 8bu有关艾弗里的肺炎双球菌的转化实验和噬菌体侵染细菌实验的叙述错误的是A．两个实验的设计思路是相同的，即设法将DNA和其他物质分开，直接地、单独地观察DNA和其他物质的作用B．肺炎双球菌的转化实验中的转化因子是S型细菌中的DNA片段C．在含32P的培养基上培养噬菌体可以得到被32P标记的噬菌体D．32P标记的噬菌体侵染大肠杆菌实验结果上清夜具有放射性的原因可能是部分大肠杆菌解体释放的噬菌体经离心后将分布于上清液中