A:NaCl晶体、BaSO4
B:铝、二氧化硫
C:液态的醋酸、乙醇
D:熔融的KNO3、硫酸溶液
不等式组3-x⩾2(x-3)3x+12-2x-13>-1的所有整数解的和是 ____.
You can go to the 24-hour shop ___________ you want.
Will they go dancing next Sunday? (否定回答)
____, they____.
这段短文的主要意思是( )