2. 外语
  3. Meteor-psychologists (气象心理学家) are concerned with how the weather【B1】______ the behavior of people. One area of their concern is

Meteor-psychologists (气象心理学家) are concerned with how the weather【B1】______ the behavior of people. One area of their concern is

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问题     Meteor-psychologists (气象心理学家) are concerned with how the weather【B1】______ the behavior of people. One area of their concern is ion (离子) balance.
    Ions are electric charges that exist in the【B2】______ , in the air that we breathe. Ions are either positive or negative. In one cubic【B3】______ 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【B4】______ 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【B5】______ , 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【B6】______ , more upset, more【B7】______ . When there is a high【B8】______ 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.【B9】________________ .This reduction in the number of ions tends to make some people feel more depressed.【B10】______________ .More people visit doctors during those times. Meteor-psychologists are beginning to understand the connection between ions and health.【B11】_________________________ .
【B9】
选项
答案In certain areas with heavy air pollution, the total number of ions is reduced
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