中亚荒漠植被根据主要层植物特征可划分为蒿荒漠，猪毛莱荒漠，（）三个类型。
参考答案：灌木荒漠
The work ________ by William Blake is a lovely volume of poems, presenting a happy world, though not without its evils and sufferings.
A．Songs of Innocence
B．Songs of Experience
C．Poetical Sketches
D．Lyrical Ballads
湿地指天然或人工、长久或暂时性的沼泽地、泥炭地或水域地带，带有静止或流动，或为淡水、半淡水、咸水体，包括低潮时水深超过6米的水域。()
