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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单项选择题
According to this passage, the practice of sex selection ______.
A．can help to prevent all genetic problems
B．is totally unacceptable to ethics experts
C．was already realized five hundred years ago
D．will benefit families with certain inheritable diseases
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
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