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
Which of the following is the best title for this passage
A．Sexual Discrimination.
B．Sex Selection.
C．Differences between Girls and Boys.
D．Henry III and His Six Wives.
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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