18.在($\frac{2}{3}$)2,($\frac{3}{4}$)-2,($\frac{6}{5}$)2,($\frac{6}{7}$)0这四个数中,最小的是( )
0 282324 282332 282338 282342 282348 282350 282354 282360 282362 282368 282374 282378 282380 282384 282390 282392 282398 282402 282404 282408 282410 282414 282416 282418 282419 282420 282422 282423 282424 282426 282428 282432 282434 282438 282440 282444 282450 282452 282458 282462 282464 282468 282474 282480 282482 282488 282492 282494 282500 282504 282510 282518 366461
| A. | ($\frac{2}{3}$)2 | B. | ($\frac{3}{4}$)-2 | C. | ($\frac{6}{5}$)2 | D. | ($\frac{6}{7}$)0 |