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for it means that the life of most species is controlled by 4 conditions.

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People also react very differently to exposure to indoor air pollutants. Further research is 9 to

This means finding out how an organism 6 and reproduces in certain surroundings.

That car ___________________(尽给我添麻烦) ever since I bought it.

But for his wife’s encouragement, he _____________ (就不能发明那个机器).