语法与词汇 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.
【正确答案】 D
【答案解析】句意：涌浪冰川在大多数时候和一般的冰川一样，一天平均只前进几英尺。但每相隔十年到百年不等，这些冰川便会以比平时快百倍的速度向前奔涌。interval表示时间上的间隔。period指一段时期。两者意义相近。record记录，记载。speed速度。distance距离。因此，本题正确答案为D。