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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