--We'd better hurry; we'll be late.

--________? Do you really want to listen to the boring lecture?

A．For what

B．How so

C．What else

D．So what

生长量和形质指标远远优于同等立地条件下同种同龄树木的单株是（）。

A.优良品种

B.优良类型

C.优树

D.优良种源