B) Small sheep dogs.

　　D) Small ringleaders.

　　A) Drug transportation from Columbia to New York.

　　C) Varied drug transportation methods

　　KEY：DACCC

　　Many scientists today are convinced that life exists elsewhere in the universe---life probably much like that on our own planet. They reason in the following way.

　　Life requires the right amount and kind of atmosphere. This eliminates all those planets in the universe that are not about the same size and weight as the earth. A smaller planet would lose its atmosphere; a larger one would hold too much of it.

　　Finally, life could evolve only if the planet is just the right distance from its sun. With a weaker sun than our own, the planet would have to be closer to it. With a stronger sun, it would have to be farther away.

　　This process of elimination seems to leave very few planets on which earthlike life might be found. However, even if life could exist on only one planet in a million, there are so many billions of planets that this would still leave a vast number on which life could exist.

　　A) has different laws.

　　C) shares the same laws

　　2. The existence of life depends on all of the following factors EXCEPT

　　B) our own solar system.

　　D) the right distance from the sun.

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