Parents and children should communicate more to ________the gap between them so that they can

understand each other better.[ ]

A. open

B. narrow

C. widen

D. leave

肾糖阈值为（）

A.8mmol／L

B.8.88mmol／L

C.9.5mmol／L

D.8.5mmol／L

E.10mmol／L