下列不能说明生物适应环境的是
A．荒漠中仙人掌的叶退化成刺
B．我国“三北”防护林工程能防风固沙
C．林中的枯叶蝶长得像一片落叶
D．工业城市中的深色桦尺蠖较多
答案：B
解：生物必须适应环境才能生存，如沙漠上的植物必须耐旱才能生存．
A、仙人掌，叶片退化成刺，可以降低蒸腾作用，减少水分的散失，适应干旱缺水的沙漠环境，说明了生物对环境的适应，故不符合题意；
B、我国“三北”防护林工程能防风固沙，属于生物对环境的影响，符合题意．
C、林中的枯叶蝶长得像一片落叶，不易被敌害发现，是枯叶蝶对环境的适应，故不符合题意；
D、工业城市中的深色桦尺蠖较多，工业城市中环境污染严重，深色桦尺蠖只有颜色深才能适应周围的环境而不被敌害发现，是对环境的适应，故不符合题意；
故选：B
点评：解答此类题目的关键是理解不同生物适应环境的方式不同．
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