单项选择题

A ______ refers to an animal that is born from its mother's body, not from 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
Some workers in the nuclear power station were exposed to high levels of ______.
A．radiation
B．cancer
C．microwaves
D．high temperature
单项选择题
This is only a ______ agreement: nothing serious concluded yet by far.
A．tentative
B．local
C．decisive
D．kidding
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