单项选择题 提出科学发展观的根本依据是( ) A．初级阶段的基本国情 B．新世纪新阶段特征 C．发展实践和发展理论 D．党在21世纪的三大历史任务

多项选择题 下列属于细胞外基质（ECM）成分的是（）

问答题 Ecstasy Affects Mental HealthJim had been suffering from extreme anxiety since his early twenties.Tying Ecstasy did make him feel high and help his condition，but only for a short period of time；in the end.if increased his anxiety，paranoia，and feelings of unreality.And he is nor alone --for people who already suffer from anxiety disorders，use of Ecstasy is more likely to worsen their conditions.Ecstasy also has been associated with often mental health conditions such as depression.Youngsters who use Ecstasy weekly hove been shown to frequently experience depression in which they want to kill themselves sometimes.According to a survey，teens who use Ecstasy weekly are three times more likely to have such thoughts than non-using teenagers.Write your paragraph below：