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

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

A．negative
B．positive
C．neutral
D．favorable

单项选择题

Which of the following can not be used as the title for this passage

A．Some Findings on Oceanic Salinity.
B．Salt Production and Oceanic Salinity.
C．Main Differences in Oceanic Salinity.
D．Basic Processes of Changes in Oceanic Salinity.

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