单项选择题

It can be concluded from the passage that the author's attitude toward "sex selection" is ________.

A．negative
B．positive
C．neutral
D．favorable
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单项选择题
Girl sperm was preferred to boy sperm in the research most probably because ________.
A．girl sperm contains more genetic material
B．more mothers want to have girl babies
C．girl sperm is healthier and more active
D．girl sperm is more easily purified
单项选择题
The gender of the baby is decided by ________.
A．the father's DNA
B．the mother's DNA
C．the father's sperm
D．the mother's egg
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