单项选择题

A ______ refers to an animal that is born from its mother's body, not form an egg, and drinks its mother's milk as a baby.

A．mammoth
B．penguin
C．mosquito
D．mammal
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单项选择题
NASA is casting a wider net in the space shuttle investigation as to what caused the spacecraft to swing out of control and ______ moments before it was to land.
A．disassemble
B．disembark
C．disintegrate
D．disinherit
单项选择题
Most nurses are women, but in the higher ranks of the medical profession women are in a ______ .
A．scarcity
B．minority
C．minimum
D．shortage
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