脑穿通畸形与脑裂畸形主要不同点在于（）。
A.致病时间
B.诱发因素
C.病变范围
D.病变部位
E.临床表现
参考答案：A
He stood up, _____ the large door and looked outside. There on the ground lay a white dog. [ ]
A. opens
B. opened
C. opening
D. having opened
原料中含有铁、镍、钒等重金属。
