如何在项目面板中创建和管理文件夹？
参考答案：
双击窗口内的空白处，弹出对话框，选择导入，右键单击空白处弹出对话框导入。
参与凝集试验的抗体主要是（）
A.IgA和IgM
B.IgA和IgG
C.IgG和IgM
D.IgG和IgE
E.IgM和IgE
Why ____ a notebook with you? I've left it at home. [ ]
A. don't have
B. not having
C. not you have
D. don't you have
