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Which is NOT correct description about Medullary bone? [br] [originaltext] Sc
Which is NOT correct description about Medullary bone? [br] [originaltext] Sc
游客
2024-10-30
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问题
Which is NOT correct description about Medullary bone? [br]
Scientists have discovered evidence that a dinosaur found in Montana was a female. Scientists have never before been able to reliably determine the sex of fossilized dinosaurs. The latest discovery gives them a tool to identify at least some females. What they found was a layer of something called medullary bone inside the thighbone of a dinosaur dug up five years ago. Scientists had cut the bone into two pieces to get it into a helicopter. Medullary bone is only known in ovulating birds, it’s a source of calcium that birds draw to make shells for their eggs. Writing in the journal Science, the scientific team believes the bone layer could be a way to identify other female dinosaurs but only if they died while making eggs and were then fossilized. They point out that the discovery confirms the view that modem birds are the closest living relatives of the two-legged dinosaurs.
选项
A、Modem birds are the closest living relatives of the two-legged dinosaurs.
B、Dinosaurs have medullary bone.
C、Medullary bone is only known in ovulating birds.
D、Medullary bone is a source of calcium for birds to make shells for their eggs.
答案
A
解析
本题考查对新闻细节的捕捉。根据文中原文"What they found was a layer of something called medullary bone inside the thighbone of a dinosaur dug up five years ago.”可知科学家们在恐龙化石中发现了一层脊髓骨。接着说明只在产卵的鸟类中发现过这种物质,选项A正确。另外说明脊髓骨是鸟类吸取形成鸟壳的钙质的主要来源。由此可知,脊髓骨中必定富含钙质,选项B、 C均正确。因此只有选项D的说法不正确,为本题答案。
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