练习材料：
Lesson 13-1 The search for oil
The deepest holes of all made for oil, and they go down to as much as 25,0000 feet. But we do not need to send men down to get the oil out, as we must with other mineral deposits. The holes are only borings, less than a foot in diameter. My particular experience is largely in oil, and the search for oil has done more to improve deep drilling than any other mining activity. When it has been decided where we are going to drill, we put up at the surface an oil derrick. It has to be tall because it is like agiant block and tackle, and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.
应用配置：L0+L4
知识笔记： mineral/mɪnərəl deposits/dɪˈpɒzɪts diameter/daɪˈæmɪtə miningmaɪnɪŋ/ derrick/dɛrɪk giant/ʤaɪənt block/blɒk tackle/tækl
练习感悟：用时43分钟。长句子的短句是个技巧，需要注意。一口气不太容易读下来，还是需要停顿。
