1,3 -丁二烯是非常重要的有机化工原料。以下是合成PHB（一种可降解的塑料）的路线。 已知
完成下列填空：
(1)写出C的结构简式：____________。反应④的反应条件________。
(2)上述转化过程中属于加成反应的是___________（填序号）。
(3)反应②符合绿色化学思想（碳原子的利用率为100%），则A的结构简式为：________。
(4)核磁共振氢谱可以确定有机物分子中不同化学环境氢原子的种类。例如，核磁共振氢谱表明
CH3CH2OH中有三种不同化学环境的氢原子。物质C有一同分异构体，能发生银镜反应，且核磁共振氢谱表明该化合物只有两种不同化学环境的氢原子，写出该化合物的结构简式：____________
(1)
；浓硫酸、加热
(2)①③
(3)CH3-C
C-CH3
(4)OHC-CH2-O-CH2-CHO
| 完形填空。 | |||
| Last Sunday we had a fantastic trip. My father, my mother and I __1__ to summer camp. We went to the mountains. First we __2__ to the foot(脚) of the mountain __3__ bus. In the middle of the mountain there was a river(河). The water was clean. I washed my face(洗脸) __4__ the water. It was warm. There __5__ some fishes in the river. In the mountain there were flowers(花). They were very __6__ . At 12 o'clock, many people got together (在一起), and they were very __7__ . We made our lunch in the mountain. The food was very _8_ , and we liked it very much. After lunch, we went on our trip. Last, we got to the top (顶) of the mountain. We were very _9_ . It was really _10 . | |||
( )1. A. go | B. goes | C. going C. gets C. over C. in C. was C. beautiful C. busy C. expensive C. interesting C. fun | D. went D. getting D. with D. for D. are D. tired D. difficult D. delicious D. sad D. rainy |