—What _____ are you doing ?

—I'm looking for my book.[ ]

A. so far          

B. all year      

C. on earth        

D. in the future

血清脂蛋白甘油三酯含量由多到少排列的顺序是( )

A．CM、LDL、VLDL、HDL
B．HDL、LDL、VLDL、CM
C．LDL、IDI、HDL、CM
D．CM、VLDL、LDL、HDL