1. Which of the following statements is CORRECT?
　　[ A ] Biologists are conducting research where psychologists have given up.
　　[ B ] Brain differences point to superiority of one sex over the other.
　　[ C ] Results of scientific research fail to support popular belief.
　　[ D ] The structural difference in the brain between the sexes has long been known.
　　2. According to the passage it is commonly believed that brain differences are caused by _______factors.
　　[ A ] biological
　　[ B ] psychological
　　[ C ] physical
　　[ D ] social
　　3. “these differences” in paragraph 5 refer to those in __
　　[ A ] skills of men and women
　　[ B ] school subjects
　　[ C ] the brain structure of men and women
　　[ D ] activities carried out by the brain
　　4. At the end of the passage the author proposes more work on
　　[ A ] the brain structure as a whole
　　[ B ] the functioning of part of the brain
　　[ C ] the distinction between the sexes
　　[ D ] the effects of the corpus callosum
　　5. What is the main purpose of the passage?
　　[ A ] To outline the research findings on the brain structure.
　　[ B ] To explain the link between sex and brain structure.
　　[ C ] To discuss the various factors that cause brain differences.
　　[ D ] To suggest new areas in brain research.