A、B两种有机物的分子式均为C₆H₁₂O₂，A水解后得到C和D，C能发生银镜反应，D不能发生消去反应；B水解后得到E和F，F不能氧化产生E，但其同分异构体经氧化后可得E．请判断：

（1）A的结构简式 ____  B的结构简式 ____

（2）写出C发生银镜反应的方程式 ____

阅读判断。根据短文内容，判断下列句子的正与误。

Long long ago, there was no paper in the world. People had to write characters(汉字) in bamboo slips or stones.Then there was a man named Cai Lun who was a Chinese man. He made people use all kinds of things to invent paper. From then on, people can use paper to write on. Paper is a great invention. We always remember the great inventor Cai Lun. Nowadays paper is very useful in our work, study and our life.It really means a lot to human beings

阅读程序框图，如果输出的函数值在区间$\frac{1}{4},\frac{1}{2}$内，则输入的实数x的取值范围是____ 　．

Please _______ her _______ it.