如图为心脏结构示意图,医生给某人右手臂静脉注射一种药物治疗头痛.药物通过心脏的途径是( )
A:Ⅰ→Ⅲ→Ⅱ→Ⅳ
B:Ⅳ→Ⅱ→Ⅲ→Ⅰ
C:Ⅰ→Ⅲ→Ⅳ→Ⅱ
D:Ⅳ→Ⅱ→Ⅰ→Ⅲ
① How much cheese do you want ? ____ A. They will come tomorrow.
② How many things are there ? ____ B. I'm shopping .
③ When will these things come ? ____ C. Half a kilo.
④What are you doing ? ____ D. Thirty-seven.
设有两个命题p:不等式|x|+|x-1|≥m的解集为R;q:函数 f(x)=-(7-3m)x是减函数.若这两个命题中有且只有一个真命题,求实数m的范围.