Choose what to eat is no longer as easy as it once was. Our eating habits  1.       

have changed , as have our way of life. And the fuel we need for our      2.        

body is also different. Tradition diets often have too much fat and too     3.        

much calories for the 21^st-century person. If we want to keep up with the  4.       

high pace of modern life, we had better to learn to make the right choices  5.       

about what and how we eat. Because we have so much to choose, many    6.       

companies offer advice about what we should eat. It’s good if we spend our  7.      

time and money in buying food and keep a balanced diet. Instead of eating   8.     

expensive diet or going on unhealthy diets, we can simply try to eat little    9.    

sugar and take more exercise. I hope that everyone keeps a good health.    10.                                          

冠折露髓后，行活髓切断的成功关键是（）

A.揭顶完全

B.止血彻底

C.无菌操作

D.放盖髓剂

E.定期观察