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单选题
According to the passage, the use of an adjustable mirror increases the oven temperature by ______.
A
80-120 degrees Celsius
B
at least 80 degrees Celsius
C
up to 30 degrees Celsius
D
up to 15 degrees Celsius
参考答案
参考解析
解析：
题干中的关键词为adjustable mirror，从而定位到第二段倒数第五句，该句指出安装在炉箱一旁的adjustable mirror可把太阳光反射到炉箱内部，从而把温度提升到15-30 degrees Celsius（摄氏度），可知该可调镜可将炉箱温度最高提升到30摄氏度，故选C。
题干中的关键词为adjustable mirror，从而定位到第二段倒数第五句，该句指出安装在炉箱一旁的adjustable mirror可把太阳光反射到炉箱内部，从而把温度提升到15-30 degrees Celsius（摄氏度），可知该可调镜可将炉箱温度最高提升到30摄氏度，故选C。
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