单选题According to the passage, the adjustable mirror is most useful ______.Aat middayBwhen it is coldCWhen firewood is lackingDin improving taste and nutrition
单选题
According to the passage, the adjustable mirror is most useful ______.
A
at midday
B
when it is cold
C
When firewood is lacking
D
in improving taste and nutrition
参考解析
解析：
文章末端倒数第五句讲述了可调镜的作用后，下一句指出“This is most useful during the winter when the sun is lower”，可见adjustable mirror在冬天，即天冷的时候最有效。
文章末端倒数第五句讲述了可调镜的作用后，下一句指出“This is most useful during the winter when the sun is lower”，可见adjustable mirror在冬天，即天冷的时候最有效。
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