题目内容：
回答题Sports have always been ruled by the weather．Rain, sleet, snow and cold called the plays．Baseball fans have often sat in the rain without cover, waiting for the sun to come out and the game to begin．Football lovers sometimes took days to warm up after sitting through a freezing cold Sunday game．For both sports fans and players, the domed stadium was like something out of a dream．A huge plastic bubble kept out rain and snow．There was heat to keep things comfortable year round．Domed stadiums have clearly changed the course of sports．Still, they did have their problems atfirst．Most of these problems were discovered and solved at the Houston Astrodome．This was the world's first stadium with a lid．For the fans, it was great．But there were some problems for the players．Baseball outfielders had the most difficult time．They had to learn to catch in a field with a roof．At first this was almost as difficult as playing in the dark．The glass of the roof was light colored, to let sunlight in．Sunlight was needed to keep the grass on the field alive．But the light roof blended(混合)too welt with the white baseball．Fly balls seemed to drop out of nowhere．Even skilled fielders were making errors．Finally, the decision was made to paint the glass of the roof dark．The problem was solved．But what about the grass? Well, the real grass was dug up and replaced with artificial turf!
This passage is about ________ A．baseball games
B．cold weather
C．how to play outfield
D．domed stadiums
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