依赖间隙连接完成的生命活动有()。①神经元间的电突触处冲动传导②细胞吞噬③心肌收缩④细胞分裂⑤小肠平滑肌蠕动
A.①②
B.②④⑤
C.①③⑤
D.全部
参考答案:C
—Does he like playing football?
—Yes, he _____. [ ]
A. little
B. likes
C. do
D. does
期权合约