题目

The famous writer often says that he ________ so much without the support and encouragement from his wife. A. shouldn’t achieve B. shouldn’t have achieved C. couldn’t achieve D. couldn’t have achieved 答案：D牛奶中含有乳球蛋白和酪蛋白等物质，在奶牛的乳腺细胞中，与上述物质合成有密切关系的是?(    ) A. 线粒体、内质网、中心体、高尔基体      B. 线粒体、核糖体、内质网、高尔基体 C. 核糖体、中心体、内质网、高尔基体       D. 线粒体、核糖体、中心体、高尔基体