皮皮学，免费搜题
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【单选题】
心脏正常起搏点位于A.
结
B.
心房
C.
房室交界区
D.
耶细胞
E.
心室
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皮皮学刷刷变学霸
举一反三
【简答题】GPS卫星位置采用（）大地坐标系。
【单选题】The twins in Shanghai last week but now they in Hainan. [ ]
A.
are ; are
B.
were ; were
C.
were ; are
D.
are ; were
【简答题】When the twins were three months old, their parents died, and they were placed in separate foster(抚养)homes.
【单选题】Why study identical twins that were separated at birth?
A.
Yes,identical twins tend to be similar if they didn't grow up together.
B.
ldentical twins inherit the same genes.
C.
Twins feel close because they have a similar appearance.
D.
Studying them helps us understand biolgical influences.
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