题目内容
（请给出正确答案）
[主观题]
A vertical shift of weight to a position above the vessel’s center of gravity will ______.
A.increase reserve buoyancy
B.decrease the righting moments
C.decrease KG
D.increase KM
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请参考本单元讲解的摘要结构的四段论，将下面A-B-C-D（目前的顺序是打乱的顺序）匹配成正确的顺序，组成一篇结构合理的学术摘要： A- Here we show that, by experimentally manipulating the location of the centre of mass in living birds, it is possible to recreate limb posture and kinematics inferred for extinct bipedal dinosaurs. Chickens raised wearing artificial tails, and consequently with more posteriorly located centre of mass, showed a more vertical orientation of the femur during standing and increased femoral displacement during locomotion. Our results support the hypothesis that gradual changes in the location of the centre of mass resulted in more crouched hindlimb postures and a shift from hip-driven to knee-driven limb movements through theropod evolution. B- Such functional differences, which are associated with a gradual, anterior shift of the centre of mass in theropods along the bird line, make the use of extant birds to study non-avian theropod locomotion problematic. C- This study suggests that, through careful experimental manipulations during the growth phase of ontogeny, extant birds can potentially be used to gain important insights into previously unexplored aspects of bipedal non-avian theropod locomotion. D- Birds share many traits with their dinosaur ancestors, making them the best living group to reconstruct certain aspects of non-avian theropod biology. Living birds, however, maintain an unusually crouched hindlimb posture and locomotion powered by knee flexion, in contrast to the inferred primitive condition of non-avian theropods: more upright posture and limb movement powered by femur retraction.
A、A-C-B-D
B、D-C-A-B
C、D-B-A-C
D、A-B-D-C
