We give dogs time, space and love we can spare, and ________, dogs give us their all.

A．in all

B．in fact

C．in short

D．in return

脑血栓形成的最常见原因是（）

A.高血压

B.动脉粥样硬化

C.各种脑动脉炎

D.血压偏低

E.红细胞增多症