题目

People tend to become more personal and hide less of themselves when using email. Researchers from Open University in Britain have found in a recent study that there are good reasons for this. The team of researchers asked 83 pairs of students, all strangers to each other, to solve a problem. They had to discuss this question: If only five people in the world could be saved from a world disaster, who should they be? The pairs of students had to talk over the problem either face to face or by computers. Dr. Johnson said, “They told their partners four times as much about themselves when they 贵州素有“八山一水一分田”的说法，人均耕地不足，石漠化现象突出，造成石漠化的主要原因是（ ）①降水丰富 ②不合理的农业活动 ③土层薄，水土易流失 ④地表干燥度大A．①②③ B．①③④C．②③④ D．①②③④