42.What does the passage imply about the cause of the warming cycle the Earth is now entering?
(A)It is caused by manmade pollution
(B)It is the result of a natural cycle
(C)It is created by subterranean forces
(D)It is the outcome of human habitation
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統計: A(1), B(0), C(0), D(0), E(0) #3845364
統計: A(1), B(0), C(0), D(0), E(0) #3845364