最新托福阅读：bulk

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【Paragraph 3】Leatherbacks keep their body heat in three different ways. The first, and simplest, is size. The　bigger the animal is, the lower its surface-to-volume ratio; for every ounce of body mass, there is proportionately less　surface through which heat can escape. An adult leatherback is twice the size of the biggest cheloniid sea turtles and　will therefore take longer to cool off. Maintaining a high body temperature through sheer bulk is called gigantothermy.　It works for elephants, for whales, and, perhaps, it worked for many of the larger dinosaurs. It apparently works, in a　smaller way, for some other sea turtles. Large loggerhead and green turtles can maintain their body temperature at a　degree or two above that of the surrounding water, and gigantothermy is probably the way they do it. Muscular activity　helps, too, and an actively swimming green turtle may be 7°C (12.6°F) warmer than the waters it swims through.(A　Warm-Blooded Turtle)

　　The word “bulk” in the passage is closest in meaning to

　　○strength

　　○effort

　　○activity

　　○mass

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