TOEFL Reading: ETS-TOEFL阅读机经 - O38947Y_S37TP8OJL$

According to paragraph 5, how do amphibians such as spadefoot toads survive the severe heat conditions in the North American deserts? A. They dig down into the ground and go into a resistant resting state. B. They remain in the ponds that develop after it has rained. C. They lose their outer layer of skin. D. Their eggs live dormant until the desert air becomes cooler and more moist.