C．The whales that go to breeding grounds come from a nature reserve.

　　D．Scientists have found a way to prevent whales from being stranded on beaches.

　　解析　细节理解题。根据末段“Scientists so far have been unable to explain why whales become stranded”可知，答案为A。

　　B

　　People with fat in their thighs (大腿) may live longer because the fat traps harmful fatty things and actively produces helpful things，researchers say.

　　Many studies have shown that people who accumulate fat around the stomach are more likely to die of heart disease and other causes than bottom-heavy people，but the reasons are not clear.

　　This may be because several different factors are involved，said Manolopoulos of Britain’s University of Oxford.“It is the protective role of lower-body fat that is striking，”Manolopoulos wrote in the International Journal of Obesity.“The protective functions of the lower-body fat tissue have been confirmed in many studies，”he added.Fat at the bottom and thighs appears to store extra fatty acids.

　　People with fat in their thighs also appear to have lower levels of things called inflammatory cytokines (炎性细胞因子)—signaling chemicals involved in the body’s response to infection that also can play a role in heart disease when they are inappropriately active.

　　Fat on the legs may also absorb fats from the diet，keeping them from harming the body when people overeat，Manolopoulos said.Fat in the thighs may also be more stable，he said，with studies showing fat around the stomach breaks down quickly when a person is on a diet or feeling stress，releasing potentially harmful components from the fat.The exact adjustable functions of

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