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【题目】我国北起黑龙江,南至海南,西起新疆,东至沿海,不论是青藏高原,还是长江中下游平原,都有油菜生长。读图回答下列各题。

【1】造成我国东部地区油菜开花日期南北差异的主要因素是

A纬度位置

B.海陆位置

C.地形地势

D.人类活动

【2】造成我国青藏高原油菜开花日期较迟的主要因素是

A纬度位置

B.海陆位置

C.地形地势

D.人类活动

【3】有关图中我国油菜集中产区的描述,正确的是

A雨季比东北开始迟,结束早

B.地形相对平坦

C.全部位于地势第一级阶梯

D.雨热不同期

【答案】

【1】A

【2】C

【3】D

【解析】

试题分析:

【1】受纬度因素的影响,世界气温从低纬度向高纬度逐渐降低,使我国东部地区油菜开花自南向北次第开放;

【2】:青藏高原夏季气温偏低,主要原因是地势高,号称世界屋脊,因此气温低,开花迟;

【3】从图中可以看出:我国油菜集中分布在四川盆地和长江中下游平原,这些地方热量足,花期长,雨热不同期,油菜花的产量高,是我国油菜的主要种植区。

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