题目

    A good way to pass an examination is to work hard every day in the year. You may fail in the examination if you are lazy for most of the year and then work hard only a few days before the examination. A few days before the examination you should start going to bed early.    Do not stay up late at night learning things. Before you start the examination, read carefully over the question paper. Try to understand the exact meaning of each question before you pick up your pen to write. When you have at last finished your examinations, read over your answers. Correct any mistake wh下列叙述中正确的是(　　)A.天然蛋白质水解的最终产物都是α-氨基酸B.通过盐析作用析出的蛋白质再难溶于水C.蛋白质溶液能发生丁达尔效应D.蛋白质溶液中的蛋白质能透过半透膜