－Sunday is a public holiday, ___ children should get close to nature.

－But most of them have several lessons to attend.

A．where

B．which

C．in which

D．when

内河船员申请海船船员适任证书时，不能申请考试评估的证书有：（）

A、甲类船长

B、乙类一等船长

C、乙类二等船长

D、丙类一等船长

E、丙类二等船长

F、丁类船长