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
  
  

Task 1　　

16.Paragraph①_____.

17.Paragraph②_____.

18.Paragraph③_____.

19.Paragraph④_____.

20.Paragraph⑤_____

A.proteins and calcium

　　B.fat and sugar

　　C.cough and cold

　　D.your body look and feel young

　　E.drink milk and honey

　　F.of calcium

Racists have low self-esteem.

• A、
  True
  
  
  
  

• B、False
  
  

• C、.Not Given