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,座椅下的开关S1闭合,若未系安全带,则开关S2断开,仪表盘上的指示灯亮起;若系上安全带,则开关S2闭合,指示灯熄灭。下列设计最合理的电路图是( )A. B. C. D.
you must go and play football,at least wait until school is over.( )
If
Whether
Unless
So that
The woman over there looks like our English teacher.
It be her.She' s having a meeting in Beijing now.( )
may not
mustn' t
shouldn' t
can' t
The price of vegetables so quickly these days.
Oh,no,but I don' t think so.( )
afford
rises
improves
raise
my surprise,the twins have nothing common.( )
With; in
To; in
In; in
To; of
Do you find yourself getting impatient or with people over unimportant things?( )
bored
boring
tiring
angrily