生殖细胞肿瘤不包括()
A．生殖细胞瘤
B．恶性畸胎瘤
C．内皮窦肿瘤
D．绒毛膜上皮癌
E．脊索瘤
参考答案：E
三角形的三条边长分别为3cm、5cm、xcm，则此三角形的周长 y(cm)与x(cm)的函数关系式是（ ）；自变量x 的取值范围是（ ）
They _____ TV when the lights went out. [ ]
A. watched
B. had watched
C. would watched
D. were watching
