将保险合同分为定值保险合同和不定值保险合同是以( )为标准的

组成足内侧纵弓的骨有（）。

A．跟骨
B．距骨
C．足舟骨
D．骰骨
E．第1～3楔骨

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听力原文：Thank you for staying tuned to Talk Tonight. Our special guest this evening is a graduate of West Point. He was a former intelligence officer and retired lieutenant general who served under two presidents. This man is also an expert on Russia and frequently lectures at universities across the nation. He is here this evening promoting his new book, Behind the Kremlin, which gives us insight on Russian politics. It is currently on the best seller's list. It's my plesure now to welcome Mr. Ivan Strand.What is the main purpose of this speech?A．To describe a bookB．To promote a productC．To introduce a guestD．To announce a program 点击查看答案