练习材料：

L42-3: Modern cavemen

They plunged into the lake, and after loading their gear on an inflatable rubber dinghy, let the current carry them to the other side. To protect themselves from the icy water, they had to wear special rubber suits. At the far end of the lake, they came to huge piles of rubble which had been washed up by the water. In this part of the cave, they could hear an insistent booming sound which they found was caused by a small waterspout shooting down into a pool from the roof of the cave. Squeezing through a cleft in the rocks, the pot-holers arrived at an enormous cavern, the size of a huge concert hall. After switching on powerful arc lights, they saw great stalagmites -- some of them over 40 feet high -- rising up like tree-trunks to meet the stalactites suspended from the roof. Round about, piles of lime-stone glistened in all the colours of the

rainbow. In the eerie silence of the cavern, the only sound that could be heard was made by water which dripped continuously from the high dome above them.

任务配置：L0+L4

知识笔记：

plunge /plʌnʤ/v.跳进(水中)

gear n.设备

inflatable /ɪn'fleɪtəbl/ adj.需充气的

rubber dinghy 橡皮艇

waterspout /'wɔtəspaʊt/ n.水龙卷

arc light 弧光

arc n.弧状 a curved shape or line

stalagmite /stə'lægmaɪt/ n.石笋

stalactite /stə'læktaɪt/ n.钟乳石

limestone n.石灰岩

glisten /'glɪnsən/ v.闪光

eerie /'ɪri/ 怪异而令人恐惧的strange and frightening

dome n.穹顶，圆屋顶

drip v.滴下

rubble n.碎石

cleft n.裂口

cavern n.大洞穴 a large cave

wash up 冲刷

练习感悟：

Never leave the things until tomorrow you can do today.