【題目】我國北起黑龍江，南至海南，西起新疆，東至沿海，不論是青藏高原，還是長江中下游平原，都有油菜生長。讀圖回答下列各題。

【1】造成我國東部地區(qū)油菜開花日期南北差異的主要因素是

A．緯度位置

B．海陸位置

C．地形地勢

D．人類活動

【2】造成我國青藏高原油菜開花日期較遲的主要因素是

A．緯度位置

B．海陸位置

C．地形地勢

D．人類活動

【3】有關(guān)圖中我國油菜集中產(chǎn)區(qū)的描述，正確的是

A．雨季比東北開始遲，結(jié)束早

B．地形相對平坦

C．全部位于地勢第一級階梯

D．雨熱不同期

【答案】

【1】A

【2】C

【3】D

【解析】

試題分析：

【1】受緯度因素的影響，世界氣溫從低緯度向高緯度逐漸降低，使我國東部地區(qū)油菜開花自南向北次第開放；

【2】:青藏高原夏季氣溫偏低，主要原因是地勢高，號稱世界屋脊，因此氣溫低，開花遲；

【3】從圖中可以看出：我國油菜集中分布在四川盆地和長江中下游平原，這些地方熱量足，花期長，雨熱不同期，油菜花的產(chǎn)量高，是我國油菜的主要種植區(qū)。

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