大多为囊性,囊液呈黄褐色或深褐色,内含大量胆固醇结晶,囊壁可有钙化的肿瘤是()
A.血管网状细胞瘤
B.颅咽管瘤
C.星型细胞瘤
D.少突胶质细胞瘤
E.室管膜瘤
参考答案:B
Her sister suggested _______ to the Great Wall. [ ]
A. go
B. going
C. to go
D. went
哪些因素影响神经脊细胞多能性?