— Is there anything you want to know?

— I just wonder ____ that makes Jim so excited.

A．what it is

B．what he does

C．how it is

D．why it does

下列关于正常人头围大小的叙述，错误的是（）

A.新生儿的头围约34cm

B.出生后第二年增加2cm

C.18岁以后头围即无变化

D.18岁头围可达60cm或以上

E.出生后前半年增加8cm，后半年增加3cm