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Small dogs generally live longer than big dogs so that yappy Yorkshire terrier next door could be around for a long time. But body size isn’t the only factor that{{U}} (36) {{/U}}how long dogs survive. Personality influences life span, too, according to a new study that might help explain how animal{{U}} (37) {{/U}}evolve.
Research on animals from ants to apes has found that different{{U}} (38) {{/U}}have different personalities. Some are timid, others{{U}} (39) {{/U}}. Biologists have proposed that temperaments evolved along with life history.{{U}} (40) {{/U}}, violent animals use a lot of energy fast in{{U}} (41) {{/U}}short lives, the thinking goes, whereas calmer animals last longer, saving themselves to{{U}} (42) {{/U}}later in life.
But it’s hard to run evolutionary{{U}} (43) {{/U}}on these personalities in anything longer lived than a fruit fly. So evolutionary biologist Vincent Careau of Universit6 de Sherbrooke in Canada came up with

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[填空题]Small dogs generally live longer than big dogs so that yappy Yorkshire terrier next door could be around for a long time. But body size isn’t the only factor that (36) how long dogs survive. Personality influences life span, too, according to a new study that might help explain how animal (37) evolve.
Research on animals from ants to apes has found that different (38) have different personalities. Some are timid, others (39) . Biologists have proposed that temperaments evolved along with life history. (40) , violent animals use a lot of energy fast in (41) short lives, the thinking goes, whereas calmer animals last longer, saving themselves to (42) later in life.
But it’s hard to run evolutionary (43) on these personalities in anything longer lived than a fruit fly. So evolutionary biologist Vincent Careau of Universit6 de Sherbrooke in Canada came up with an idea: dogs. "All these breed differences reflect an experiment on

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