The answer is Dregg did delightfully on his Antarctic test because ... he knew it cold! This puzzle is a play on words; when somebody is fully set for every answer on a test, they can be said to "know it cold." At the same time the Antarctic is recognized for being, in fact, very cold. So in this joke Dregg knew all the answers about the cold weather of the Antarctic.
The correct answer is: three readings!
The first reading is the general introduction of the bill, and after this, the bill will be worked on in a committee.
In the second reading, the bill is presented to the full house and discussed.
After the third and final reading (which might include the changes in the bill) the bill will be voted on!
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