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【题目】读图,思考回答。

(1)秦岭——淮河一线油菜开花日期是________(月、日)左右。

(2)由图可以判定我国东部油菜花开花日期的规律是什么?

(3)形成上述规律的原因是什么?

【答案】(1)4月1日

(2)从南向北花期越来越晚。

(3)受纬度因素的影响。

【解析】(1)读图可知:秦岭——淮河一线油菜开花日期是4月1日左右。

(2)纬度位置是影响气候的基本因素,一般是纬度越低,气温越高;纬度越高,气温越低.读图可知:我国东部地区自南向北温度越来越低,因此我国东部油菜开花期从南向北时间越来越晚。

(3)纬度位置是影响气候的基本因素,一般是纬度越低,气温越高;纬度越高,气温越低.读图可知:我国东部地区自南向北温度越来越低,因此我国东部油菜开花期越往北时间越晚。

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