题目内容

【题目】下表为我国9月26日四城市的实测气温数据。回答下列问题。

城市

纬度

海拔（m）

最高气温（℃）

最低气温（℃）

天气

北京

39.8°N

54

18

3

晴

杭州

30.2°N

40

17

11

多云

海口

20.0°N

14

27

23

雨

拉萨

29.7°N

3649

19

6

多云

【1】最低气温拉萨比杭州低，主要原因是拉萨（ ）。

A．纬度低 B．大气削弱作用强

C．大气保温作用弱 D．大气反射作用弱

【2】北京比海口气温日较差（一天中最高气温与最低气温的差）大，主要原因是（ ）。

A．纬度高 B．白昼短

C．大气吸收能力强 D．天气晴朗

【答案】

【1】C

【2】D

【解析】

试题分析：

【1】读图可知，拉萨纬度低于杭州，纬度低应当温度高，A错。拉萨海拔高，大气稀薄，削弱作用弱，B错。由于空气稀薄，大气逆辐射弱，C对。大气反射作用越弱，到达地面的太阳辐射越多，气温越高，D错。故选C。

【2】读图可知，该日北京天气晴朗，海口有雨，北京白天大气削弱作用弱，气温升高快，夜晚大气逆辐射弱，降温剧烈，昼夜温差大，故选D。

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