绿色植物进行光合作用时，不需要[ ]
A．二氧化碳
B．光
C．水
D．氧气
答案：D
You________ be careful when you are driving at night.[ ]
A. can
B. should
C. would
D. could
简述六经辨证中少阳病证的病机和临床表现。
