1.下列各组中,不是同类项的是( )
0 279498 279506 279512 279516 279522 279524 279528 279534 279536 279542 279548 279552 279554 279558 279564 279566 279572 279576 279578 279582 279584 279588 279590 279592 279593 279594 279596 279597 279598 279600 279602 279606 279608 279612 279614 279618 279624 279626 279632 279636 279638 279642 279648 279654 279656 279662 279666 279668 279674 279678 279684 279692 366461
| A. | x3y4与x3z4 | B. | -3x与-x | C. | 5ab与-2ab | D. | -3x2y与$\frac{1}{2}x$2y |