The letter was written by Darwin to thank an American geologist, Dr.Ferdinand Vandeveer Hayden, for sending him copies of his research into the geology of the region that would become Yellowstone National Park.
2018年6月四級(jí)真題（第二套）閱讀 Section C
And while assessments vary widely, geologists estimate that Antarctica holds at least 36 billion barrels of oil and natural gas.
出自-2016年12月閱讀原文
According to geologists' estimates, Antarctica has enormous reserves of oil and natural gas.
出自-2016年12月閱讀原文
"You're what you eat and drink, and that's recorded in your hair,"said Thure Cerling, a geologist at the University of Utah.