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
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
单项选择题
The DNA in the sperm cells can be measured ________.
A．in the same way how the cattle are herded
B．when they pass through a tube one behind the other
C．after they pass through a laser tube
D．when they are scanned by a laser detector all at a time
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