The garage should be kept well ventilated in order to guard against: 1.fire 2.carbon monoxide poisoning3. carbon dioxide poisoning 4. heat loss

The answer would be 2, Carbon Monoxide poisoning. It is an invisible gas that can easily build up in a non-ventilated area and is a primary gas in car exhaust, making it a danger in a garage. It is poisonous.

So you and your partner don’t get sexually transmitted diseases and so your partner doesn’t get pregnant

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.