A:Cl2
B:HCl
C:SO2
D:活性炭
(____)1. A. mouse B. tiger C. ship
(____)2. A. wake B. pick C. sleep
(____)3. A. happy B. book C.sad
(____)4. A. from B. water C. coffee
(____)5. A. strong B. weak C .run
x,3x2,5x3,7x4,9x5,11x6,…
按照上述规律,第2015个单项式是( )