题目

The reason why he got fewest apples from the tree is _____he is the shortest of all the boys. A. that            B. because            C. why            D. what   答案：A聚甲基丙烯酸羟乙酯的结构简式如图，它是制作软质隐形眼镜的材料。请写出下列有关反应的化学方程式。 (1)由甲基丙烯酸羟乙酯制备聚甲基丙烯酸羟乙酯：_____________________(2)由甲基丙烯酸制备甲基丙烯酸羟乙酯：_________________________ (3)由乙烯制备乙二醇：________________________________