题型:填空题 看图,选择正确答案。( ) 1.A. What's he doing? He's eating.( ) 2.B. What's he doing? He's drawing a picture.( ) 3.C. What's he doing? He's playing on the computer.( ) 4.D. What's he doing? He's jumping on the bed. 查看答案
题型:填空题 想一想:Ba(OH)2(固体)、CuSO4(固体)、CH3COOH(液态)这些物质为什么归为一类,下列哪些物质还可以和它们归为一类( )A.75%的酒精溶液B.HCl(气态)C.Fe(OH)3胶体D.豆浆 查看答案
题型:填空题 T细胞活化的第一信号是A.CD4与MHCⅡ类分子的结合B.CD8与MHCI类分子的结合C.TCR与抗原肽/MHC分子复合物的结合D.IL-1与相应受体之间的相互作用E.IL-2与相应受体之间的相互作用 查看答案