下列哪一类肿瘤为脑实质内肿瘤（）
A.脑膜瘤
B.室管膜瘤
C.神经纤维瘤
D.星形细胞瘤
E.垂体瘤
参考答案：D
As is known to us all,_______travels much faster than .
A．lights; sounds
B．light; sound
C．sound; light
D．sounds; lights
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