Most of us_________more than one thousand English words before we came to this school.                                                           ( )

A．would learn

B．will learn

C．have learned

D．had learned

肾小管对Na＋重吸收最大的部位是（ ）

A．近球小管

B．髓袢降支细段

C．远球小管

D．髓袢升支粗段

E．集合管