George Washington selected the city the site of the US capital, but the name “District of Columbia” was chosen ________ Christopher Columbus.

A．in return for

B．in the case of

C．in the eyes of

D．in honor of

引起白血病发热的主要原因是（）。

A.白血病性发热

B.免疫力低下

C.贫血

D.继发感染

E.出血