以下关于正常分娩的临产表现描述正确的是（）

A.初产妇临产后胎头多已入盆

B.胎膜破裂多在第二产程期间

C.经产妇第二产程不会超过30分钟

D.生理缩复环多在平脐部位看到

E.胎儿娩出标志第三产程结束

Among the following statements, which is tree about sea horse().

A. The sea horse has a long snout that is not convenient for sucking.

B. Sea horses have no scales at all.

C. The sea horse is unable to grasp sea grass or coral.

D. Sea horse can move very fast over long distance.