In English, certain nouns are spelt with _____capital letter at _____ beginning of the word; for example, names of places, such as the United States of America.

A．a; the

B．the; the

C．a; a

D．the; a

8岁儿童，出现头痛、呕吐，步态蹒跚，强迫头位等表现，诊断上应考虑（）。

A.脑膜瘤

B.垂体瘤

C.髓母细胞瘤

D.颅咽管瘤

E.星型细胞瘤