31．This is only a ______ agreement: nothing serious concluded yet by far.

A．tentative        B．local        C．decisive        D．kidding

32．Some workers in the nuclear power station were exposed to high levels of ______.

A．radiation        B．cancer        C．microwaves        D．high temperature

33．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

34．I have to say this, but this coat you've just bought is made of ______ fur; it's not real mink.

A．coarse        B．genuine        C．slippery        D．counterfeit

35．It's amazing that two researchers working independently made the same discovery ______.

A．spontaneously        B．simultaneously        C．collaboratively        D．conscientiously

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