驾驶机动车时不准穿拖鞋，吸烟，饮食及与乘车人攀谈。
参考答案：对
The medicine works more effectively ______ you drink some hot water after taking it.
A．as
B．until
C．although
D．if
直接为心脏供应血液的血管是
A.主动脉
B.主动脉弓
C.冠状动脉
D.锁骨下动脉
E.颈总动脉
