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植被生长季是指植被一年内开始返青(生长季始期)到落叶(生长季末期)之间的时段。下图示意我国华北地区某东西走向山脉各时段(从1月1日开始的天数)植被进入生长季始期和生长季末期的面积比例。据此完成下列问题。

1.该山地大部分植被的生长季是

A. 3月至8月 B. 3月至11月 C. 4月至10月 D. 5月至8月

2.该山地植被出现多个不同时段的生长季始期,主要是因为该山

A. 跨纬度大 B. 跨经度大 C. 地势起伏较大 D. 水热充足

3.甲时段进入生长季始期的植被,可能分布在

A. 海拔较高的阳坡 B. 海拔较高的阴坡

C. 海拔较低的阳坡 D. 海拔较低的阴坡

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