角结膜皮样瘤来源于()
A．胚胎粘膜细胞
B．结膜杯状细胞
C．角膜上皮细胞
D．胚胎性皮肤
E．结膜上皮细胞
参考答案：D
加工细长轴时，使用弹性顶尖，可以（）工件热变形伸长。
A.减少
B.补偿
C.抵消
D.延续
6．Although they are brothers, he’s not ______ as good-looking as his brother.
A．almost
B．nearly
C．mostly
D．mainly
