12. The reaction _________ raise the surface temperature to boiling point.
(A) generates heat enough
(B) generating heat enough to
(C) enough heat is generated
(D) generates enough heat to
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統計: A(6), B(37), C(5), D(46), E(0) #1571025
統計: A(6), B(37), C(5), D(46), E(0) #1571025