The phrase "crop rotation" (Para. 3) probably means_____.

• A、growing high-yielding crops
  
  

• B、seasonal growing of crops
  
  

• C、planting soil-enriching crops
  
  

• D、regular changing of crops
  
  

第六部分：完形补文(第41～50题，每题1.5分，共15分)

　　下面的短文有10处空白，每处空白后的括号内有一个词，请根据短文内容将其正确的形式填入文中，以恢复文章原貌，并将答案写在答题卡相应的位置上。

　　The Importance of Friendship for School-age Children

　　Friends are very important to school-age children's healthy (health) development. Research has_____(41)(show) that children who lack friends can suffer from emotional and mental difficulties later in life. They have also found that children with friends have a_____(42)(great) sense of happiness, better self-esteem and fewer problems as they grow up. Friendships provide children with more than just fun_____(43)(playmate). They help children develop emotionally and_____(44)(moral). In interacting with friends, children learn many_____(45)(society) skills, such as how to communicate, and how to cooperate. They practice_____(46)(control) their emotions and responding to the emotions of others.

They develop their_____(47)(able) to think through and negotiate different situations in their relationships. Having friends _____(48)(affect) children in many ways, even their school_____(49)(perform). Children tend to have better attitudes about school and learning when they have friends there. In short, friendships are not just a luxury, they are a_____(50)(necessary) for children.

（本题15分）

Parents are responsible for their children's self-esteem.

• A、True
  
  

• B、False
  
  

• C、Not Given