题目内容

【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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