Mom was usually busy ______ my younger sister during the night and she ______ have less sleep.[ ]

A. tending; tended  

B. tended; tending to

C. tending; tended to  

D. tended to; tending to

正常人脑脊液中糖的最低含量为（）。

A.4.0mmol/L

B.3.5mmol/L

C.3.0mmol/L

D.2.5mmol/L

E.2.0mmol/L