下列哪种分子不是CD4+细胞表达的协同刺激分子受体
A．CD2
B．CD4
C．CD8
D．CD28
E．LFA-1
参考答案：C
[2014·武汉调研]直线x－2y＋1＝0关于直线x＝1对称的直线方程是( )
A．x＋2y－1＝0
B．2x＋y－1＝0
C．2x＋y－3＝0
D．x＋2y－3＝0
The room by me last night. [ ]
A. cleans
B. cleaned
C. to clean
D. was cleaned
