Thunderclouds form when warm, moist air rises into cooler air above, because either the ground is warmer than usually or because the interaction of two air masses, one warm and one cold, forces warm air to rise.
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Abecause either the ground is warmer than usually or because
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Bbecause either the ground is warmer than usual or because of
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Cbecause of either the ground being warmer than usual or because
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Deither because of the ground's being warmer than usually or because of
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Eeither because the ground is warmer than usual or because
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正确答案: E