18.Conservation is an issue which gets a lot of attention these days-whether it means ______ old buildings,or protecting the environment.( )
0 137215 137223 137229 137233 137239 137241 137245 137251 137253 137259 137265 137269 137271 137275 137281 137283 137289 137293 137295 137299 137301 137305 137307 137309 137310 137311 137313 137314 137315 137317 137319 137323 137325 137329 137331 137335 137341 137343 137349 137353 137355 137359 137365 137371 137373 137379 137383 137385 137391 137395 137401 137409 151629
A. | recovering | B. | reserving | C. | preserving | D. | polishing |