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
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
单项选择题
What is the main idea of this passage
A．Obesity is now a global problem that needs tackling.
B．The weights increase fast throughout the whole world.
C．Obesity and starvation are two main problems in the poor world.
D．Obesity has shifted front the rich world to the poor world.
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