词汇精练——plunge

A flood of ice would then surge into the Southern Sea. With the continued rise in sea level, more ice would plunge into the ocean, causing sea levels to rise even higher, which in turn would release more ice and set in motion a vicious cycle.
The word "plunge" is closest in meaning to which of following?
(A) drop
(B) extend
(C) melt
(D) drift
 

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