32. Thunder occurs as ______ through air, causing the heated air to expand and collide with layers of cooler air.
(A) an electrical charge
(B) passes an electrical charge
(C) the passing of an electrical charge
(D) an electrical charge passes

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統計： A(22), B(2), C(32), D(124), E(0) #568801

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#818590
電荷 electrical charge
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#2670072
Thunder occurs as __...
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