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.
2017届高考英语一轮复习学案:必修2 unit 4 Cyberspace(北师大版)
2017届高考英语一轮复习课时作业:unit 3 Celebration(北师大版)
2017届高考英语一轮复习课堂检测:unit 21 Human Biology(北师大版)
2017届高考英语一轮复习课时作业:unit 17 Laughter(北师大版)
2017届高考英语一轮复习课时作业:unit 1 Lifestyles(北师大版)
2017届高考英语一轮复习课时作业:unit 15 Learning(北师大版)
2017届高考英语一轮复习限时训练:8-1 A land of diversity(新人教版)
2017届高考英语一轮复习课时作业:unit 13 People(北师大版)
2017届高考英语一轮复习课堂检测:unit 18 Beauty(北师大版)
2017届高考英语一轮复习课堂检测:unit 17 Laughter(北师大版)
2017届高考英语一轮复习课时作业:unit 7 The sea(北师大版)
2017届高考英语一轮复习课时作业:unit 20 New Frontiers(北师大版)
2017届高考英语一轮复习学案:必修2 unit 5 Rhythm(北师大版)
2017届高考英语一轮复习限时训练:1-5 Nelson Mandela-a modern hero(新人教版)
2017届高考英语一轮复习课时作业:unit 14 Careers(北师大版)
2017届高考英语一轮复习课堂检测:unit 20 New Frontiers(北师大版)
2017届高考英语一轮复习课时作业:unit 11 The Media(北师大版)
2017届高考英语一轮复习课时作业:unit 5 Rhythm(北师大版)
2017届高考英语一轮复习课堂检测:unit 19 Language(北师大版)
2017届高考英语一轮复习课时作业:unit 6 Design(北师大版)
2017届高考英语一轮复习课时作业:unit 12 Culture Shock(北师大版)
2017届高考英语一轮复习课时作业:unit 18 Beauty(北师大版)
2017届高考英语一轮复习课时作业:unit 23 Conflict(北师大版)
2017届高考英语一轮复习课堂检测:unit 13 People(北师大版)
2017届高考英语一轮复习课堂检测:unit 22 Environmental Protection(北师大版)
2017届高考英语一轮复习限时训练:8-3 Inventors and inventions(新人教版)
2017届高考英语一轮复习限时训练:1-4 Earthquakes(新人教版)
2017届高考英语一轮复习限时训练:8-4 Pygmalion(新人教版)
2017届高考英语一轮复习限时训练:1-3 Travel journal(新人教版)
2017届高考英语一轮复习课时作业:unit 21 Human Biology(北师大版)