問題詳情

People in general have always assumed that the temperature of a leaf should be in sync with the temperature of thesurrounding air. However, it’s amazing that burning temperatures seldom turn the leaves on the tree into flames.According to a study published in a famous science journal, Nature, this can be accounted for by the fact that as a resultof evolution, leaves tend to maintain at a comfortable, climate-conditioned 21 degrees Celsius. For instance, plants fromthe subtropics, say Kaohsiung, have evolved mechanisms to adjust the temperature of their leaves by angling themselvesaway from the sun. On the other hand, plants in mountain areas (e.g., Mountain Jade), where the weather is often chilly,have developed ways to “heat” their leaves by putting out more leaves per branch to huddle for warmth. After all, whatother option does a plant have in an unpleasant environment? It cannot just migrate to a cooler place.
47 Which of the following statements is true?
(A) Plants in polar regions turn their leaves away from the sun.
(B) The temperature of a leaf often changes in accordance with different climate conditions.
(C) Leaves maintain a constant temperature regardless of temperature changes.
(D) The temperature of a leaf can reach 25 degrees Celsius during the summer time.

參考答案

答案：C
難度：適中0.454545
統計：A(6),B(15),C(20),D(3),E(0)

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