影响翡翠质地的因素有（）。玻璃地是翡翠中的极品

A.透明度

B.结晶粗细

C.裂络

D.重量

E.致色微量元素

The mother of a new-born asks the nurse how often she should breastfeed her baby. Which of the following responses by the nurse would be best()

A. "Newborns should breastfed at least every 3 hours during the day. "

B. "Newborns should be fed when they cry. "

C. "As long as the baby feeds four times a day, he will get enough. "

D. "Newborns may breastfeed continuously until they stabilize. \