嘉奖令叙述事实要概括简洁，评价要恰如其分，实事求是。()
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When two goods are complements, the cross elasticity of demand is:
A. positive, and for substitutes the cross elasticity of demand is negative
B. negative, and for substitutes the cross elasticity of demand is negative
C. negative, and for substitutes the cross elasticity of demand is positive
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国家森林城市要求岸绿化江、河、湖、海、库等水体沿岸注重自然生态保护，水岸林木绿化率达80%以上。在不影响行洪安全的前提下，采用近自然的水岸绿化模式，形成城市特有的水源保护林和风景带。()
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