70. Which of the following compounds will not undergo a ring-opening reaction under thermal conditions? 
(A) Ⅰ only
(B) Ⅱ only
(C) Ⅲ only
(D) Ⅰ and Ⅱ
(E) Ⅰ and Ⅲ

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統計： A(5), B(1), C(2), D(3), E(1) #1037056

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