题目

    Long ago a Native American chief named Shenandoah lived with his tribes(部落) in what is now the state of Virginia. Little is known about Shenandoah, but in some way, the soft sound of his name was given to a river. The Shenandoah River still flows in a deep valley between the Allegheny and Blue Ridge Mountains, just as it did when Chief Shenandoah lived. It is a slow moving river, soft and as beautiful as its name. Some word experts who believe the word “Shenandoah” means “spruce river” because the waters of the river run through great forests of spruce trees(云杉).An某有机物A可发生下列变化:已知C为羧酸，且C、E不发生银镜反应，则A的可能结构有A.4种B.3种C.2种D.1种