A. They may deteriorate. B. They may benefit from economy. C. They are associated with productivity. D. They are closely related to technology.
单项选择题It was previously considered that perceptions and other mind matters could hardly be（）.
A. treated as a significant issue B. studied with scientific methods C. separated from brain activity D. handled with surgical instruments
单项选择题23（）.
A. confusing B. catching C. irritating D. inviting
