填空题

Meteor-psychologists (气象心理学家) are concerned with how the weather (36) the behavior of people. One area of their concern is ion (离子) balance. Ions are electric charges that exist in the (37) , in the air that we breathe. Ions are either positive or negative. In one cubic (38) of air there are about 2,000 ions. In the air there are more positive ions than negative ones, the ratio being about 4 negative ions to 5 positive ions. Meteor-psychologists are (39) concerned about two things related to ions. One thing is the balance or ratio between positive and negative ions. When the total number of negative ions (40) , or when the 4 to 5 ratio changes, people’s behavior may also change. Meteor-psychologists have found that when there are too many positive ions in the air, some people tend to become more (41) , more upset, more (42) . When there is a high (43) of positive ions in the air, accidents and crimes are more likely to happen. The second area of concern is the total number of ions in the air. (44) .This reduction in the number of ions tends to make some people feel more depressed. (45) .More people visit doctors during those times. Meteor-psychologists are beginning to understand the connection between ions and health. (46) .