题目内容

【题目】中国共产党第十九次全国代表大会(简称中共十九大)于2017年10月底在北京召开。读材料,回答下列各题。

1中共十九大召开时,地球公转到图3中什么位置( )

A. B.

C. D.

2会议期间,九江昼夜长短情况是( )

A. 昼长夜短 B. 昼短夜长

C. 昼夜平分 D. 出现极昼现象

【答案】

1C

2B

【解析】地球在自转的同时还在不断地绕着太阳公转,方向都是自西向东,周期是一年,因为地球的公转时,地轴始终与平面保持66.5°的夹角,所以太阳直射的地方不同,导致各地出现不一样的季节和不一样的昼夜长短,就产生了季节变化和五带的划分。

1中共十九大召开时,是2017年10月底,地球公转到图3中③位置,是在秋分日至冬至日之间,故选C。

2由题目可知,会议期间,太阳直射点是位于赤道与南回归线之间,此时北半球各地的昼长小于夜长,故选B。

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【题目】阅读下文,回答问题致蒋经国先生信(节选)
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