20. The Chongyang Festival is a Chinese traditional festival.It is celebrated on the ninth day of the ninth lunar month.It's also(81)called(call) the Double Ninth Festival. The festival started as(82)early/??:li/as the Warring States Period (475-221BC).It has a history of more than 1,700 years.Among the numbers from zero to nine,nine is the(83)highest(high) odd number (奇數(shù)).People believe that two"nines"meeting together stand for a long life.So it is a special holiday(84)forChinese people to show love and respect for their elders.They hold many(85)kinds(kind) of activities in honor of old people,wishing them good(86)health/helθ/and a long life. The festival comes during the golden time of(87)fall/f?:l/.On the day,people traditionally drink chrysanthemum (菊花)wine,eat Double-Ninth Cakes(88)and climb mountains.They also carry a kind of plant named dogwood.People in ancient times believed that (89)the plant could drive away evil (邪惡的)spirits and prevent them from(90)catching(catch) an illness in winter.