50. In the last sentence of this passage, what does the boldfaced word “quadrilingual” most likely mean in the context? (A) A person who is able to speak two languages. (B) A person who is able to speak four languages. (C) A person who is able to speak three languages. (D) A person who can speak only one language.

6. 有一均質、等向性、線彈性之彈性體，此彈性體只承受之拉應力作用 (即其它應力分量為零) 後，此彈性體之應變為： \( \epsilon_x = 0.006, \epsilon_y = \epsilon_z = -0.002 \) ，則此彈性體之楊氏模數 (Young’s modulus) 及包森比 (Poisson’s ratio) 為何？ (A) 楊氏模數\(E = 60 GPa\)，包森比ν = 0.38 (B) 楊氏模數 E = 70GPa ，包森比ν = 0.35 (C) 楊氏模數 E = 80GPa，包森比ν = 0.3333 (D) 楊氏模數 E = 90GPa ，包森比ν = 0.25

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