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单选题
It can be concluded from information contained in the passage that the average temperature at an altitude of 1 kilometer above the Earth is about _____.
A
15℃
B
9℃
C
2.5℃
D
-12℃
参考答案
参考解析
解析：
根据文中第三段第一句的信息：“Under present conditions a temperature of -18℃ can be observed at an altitude of 5 to 6 kilometers above the Earth. Below this altitude (called the radiating level), the temperature increases by about 6℃ per kilometer approaching the Earth’s surface where the average temperature is about 15℃”可以推断，海拔一千米处的平均气温大约为12℃以下，选项B 9℃最接近，因此选择B项。
根据文中第三段第一句的信息：“Under present conditions a temperature of -18℃ can be observed at an altitude of 5 to 6 kilometers above the Earth. Below this altitude (called the radiating level), the temperature increases by about 6℃ per kilometer approaching the Earth’s surface where the average temperature is about 15℃”可以推断，海拔一千米处的平均气温大约为12℃以下，选项B 9℃最接近，因此选择B项。
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