A. My father often reads books on Sundays.
B. I often do my homework on Saturdays.
C. He often watches TV in his room.
D. We often play football on the playground.
E. Ann can wash her clothes by herself.
下列各句中,没有语病、句意明确的一句是( )
— Yes. I am ______ hungry.
为保证司乘人员的安全,轿车上设有安全带未系提示系统,当乘客坐在座椅上时,座椅F的开关S1闭合,若未系安全带(安全带控制开关S2断开)仪表盘上的指示灯将亮起,当系上安全带时,安全带控制开关S2闭合,指示灯熄灭,下列电路图设计最合理的是( )