004. During most of their lives, surge glaciers behave like normal glaciers, traveling perhaps only a couple of inches per day. However, at intervals of 10 to 100 years, these glaciers move forward up to 100 times faster than usual.
The word intervals is closest in meaning to which of following?
(A) records
(B) speeds
(C) distances
(D) periods
001 A
002 A
003 A
004 D
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