31 The phrase “the former” in line8 refers to (A) the surface pressure (B) Venus1 atmosphere (C) Earth's atmosphere (D) a result

28. The passage supports which of the following statements about Native American trade in Oregon? (A) Trade was limited by the mountainous terrain, (B) Trade was more depended oc the canoe than on any other form of travel. (C) Items related to transportation were typical trade products. (D) Transportation contributed to the development and maintenance of trade.