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【单选题】
骨质破坏的X线表现A.
骨密度减低
B.
由于钙盐减少而引起骨密度减低
C.
骨质局限性密度减低，骨小梁稀疏消失而形成骨质缺损，其中骨质结构
D.
骨质密度增高，伴或不伴有骨骼的增大
E.
早期为一段长短不定、与骨皮质平行的细线状致密影
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【单选题】盐酸氯丙嗪注射液中的Vc起抗氧剂的作用，维生素C的最大吸收波长为243nm，盐酸氯丙嗪最大波长是306nm和254nm，则采用紫外-可见分光光度法测定盐酸氯丙嗪注射液的含量时，选择的最佳测定波长应该为
A.
243nm
B.
254nm
C.
306nm
D.
280nm
【单选题】Newly-found fossilized tracks in Alaska proved that dinosaurs' migration between Asia and North America took place ______.
A.
much earlier than experts previously thought
B.
much later than experts previously thought
C.
after Asia became an independent continent
D.
sometime around 25 million years ago
【简答题】Python语句’’.join（list（’helloworld!’））执行的结果是（）。
【单选题】The muscles of a fossilized animal can sometimes be reconstructed because
A.
they were preserved with the present relatives of the animal.
B.
they were lodged inside the animal’s skull.
C.
they were hardened parts of the animal’s body.
D.
they were attached to the animal’s skeleton.
【简答题】写出语句的运行结果: li = ["apple", "peach", "banana", "pear"] (1)','.join(li) (2) '.'.join(li)
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