until very recently it was possible to use only natural materials of various kinds for the making of clothing. both plants and animals supply these natural materials.
from plants we get cotton and linen. from animals we get such materials as wool, silk, leather, and furs. modern man now has cloth which is made synthetically. in 1884 the first artificial fiber was made, called artificial silk, rayon, nylon and dacron are best-known products developed later.
gre argument107提纲分析汇总
gre argument95提纲分析汇总
gre argument36提纲分析汇总
gre argument113提纲分析汇总
gre argument74提纲分析汇总
gre argument112提纲分析汇总
gre argument40提纲分析汇总
gre argument94提纲分析汇总
gre argument97提纲分析汇总
gre argument82提纲分析汇总
gre argument45提纲分析汇总
gre argument44提纲分析汇总
gre argument96提纲分析汇总
gre argument120提纲分析汇总
gre argument80提纲分析汇总
gre argument116提纲分析汇总
gre argument104提纲分析汇总
gre argument46提纲分析汇总
gre argument102提纲分析汇总
gre argument75提纲分析汇总
gre argument123提纲分析汇总
gre argument132提纲分析汇总
gre argument39提纲分析汇总
gre argument106提纲分析汇总
gre argument85提纲分析汇总
gre argument72提纲分析汇总
gre argument76提纲分析汇总
gre argument103提纲分析汇总
gre argument61提纲分析汇总
gre argument77提纲分析汇总
| 不限 |
| 英语教案 |
| 英语课件 |
| 英语试题 |
| 不限 |
| 不限 |
| 上册 |
| 下册 |
| 不限 |