单项选择题
A.is an occupational disease of foreign people B.may lead to very serious symptoms C.is actually not a disease D.is incurable
A.They thought highly of it and accepted it at once. B.They just accepted it at once without any hesitation. C.They just thought it a joke. D.They thought it was too artificial and took a long time to accept.
A.Lily. B.Water Lily. C.Red rose or white rose. D.Sunflower.