单项选择题

Which of the following statements is true according to this passage

A．"Girl sperm" is much bigger than "boy sperm".
B．"Girl sperm" contains more genetic material.
C．"Girl sperm" has more cells than "boy sperm".
D．"Girl sperm" is more purified than "boy sperm".
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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 diseases
B．is totally unacceptable to ethics experts
C．was already realized five hundred years ago
D．will benefit some families which need both boys and girls
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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