计算：79+799+7999+79999+799999+7999999+79999999
查看答案
材料题请点击右侧查看材料问题 查看材料
A. natural
B. real
C. living
D. genuine
人工开挖土方时，两人的操作间距应保持()。
A. 1米
B. 1米～2米
C. 2米～3米
D. 3.5～4米
We can conclude that________. 查看材料
A. the situation was nothing to be concerned about
B. Soufriere is still an active volcano
C. crater lakes are easy to hike to
D. Soufriere is a dead volcano
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