[单选题]野外救援应遂行（ ）装备物资，严防发生失温病症。
A. 防暑降温
B. 防毒防爆
C. 防病防疫
D. 防寒保暖

Passage Three
Bears mostly live alone, except for mothers and their babies, and males and females during mating season. Bears form temporary groups only in exceptional circumstances, when food is plentiful in a small areA. Recent evidence also suggests that giant pandas may form small social groups, perhaps because bamboo is more concentrated than the patchy food resources of other bear species. Other bears may live alone but exist in a social network. A male and female may live in an area partly shared in common—although they tolerate each other, each defends, its range from other bears of the same sex. Male young usually leave their mothers to live in other areas, but female young often live in a range that is commonly shared with that of their mother.
The key to a bear’s survival is finding enough food to satisfy the energy demands of its large size. Bears travel over huge territories in search of food, and they remember the details of the l
A. animals in hibernation don’t wake up easily
B. animals in hibernation are aroused regularly for energy supply
C. the body temperature of animals in winter sleep doesn’t change
D. animals in winter sleep experience drastic changes in bodily functions