读等高线地形图，回答下列问题．

（1）图中小清河流向的方向______；

（2）大青山主峰和小青山主峰的相对高度是______米；

（3）AB和CD一线和E处的地形分别是：AB______，CD______，E______（山脊、山谷、山峰、鞍部）；

（4）甲地坡度比乙地______，原因是______．

Which one is not the effect of Methadone maintenance()

A．Keep the patient from going into withdrawal

B．Keep the patient comfortable and free from craving street opioids

C．Restrain the effects of street opioids

D．Help the patient cease the opioids drug immediately