TOEFL Reading: ETS-TOEFL阅读机经 - C3ZHT9H5Q2V3VN8PL$

Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information. A. Most tropical mammals do not experience extreme temperature changes but can suffer severe food losses from long dry seasons. B. Tropical mammals in high-altitude mountains encounter more severe food shortages than other tropical mammals. C. Dry seasons up to five months long cause as much damage to food resources of tropical mammals as extreme annual changes. D. Dry seasons do not severely reduce the food supplies of tropical mammals every year but they do occur sometimes.