单项选择题

()-2,3-二甲基戊烷最多可能具有几种一氯代物异构体（包括立体异构体）？（）

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单项选择题

根据本节内容，创业者面对失败风险和严酷挑战，需要树立生态系统意识，这意味着创业要（）。

A．改善自然环境
B．服从外部环境
C．融进社会环境
D．与环境共发展

单项选择题

The sperm source of a test tube baby is the donor, the egg source is the wife, and the baby is conceived through the womb of a surrogate.The number and category of the baby's father and mother are ( )

A． 1 genetic father, 1 sociological mother, 1 genetic mother and gestating mother
B． 1 genetic father,1 genetic mother, and 1 gestational mother
C． 1 genetic father, 1 genetics-sociology mother, 1 sociological father, 1 gestating mother
D． 1 genetic father, 1 genetic mother,1 sociological mother, and 1 gestational mother