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请教两道逻辑
1. many geologists theorize that the trail of volcanic craters and cinder cones along the Snake River plain of southern idaho was produced as the north american continent slid westward over a stationary "plume," a vertical channel through which molten rock rose intermittently from the earth's core to brust through its crust.
q:which of the following, if true, tends to support the geologists' theory of how the trail was produced?
a: the newest craters and cinder cones are on the eastern margin of the trail.
想不明白？
2. no botanist lives long enough to study the complete life cycle of an individual California redwood tree. nevertheless, by observing many trees at different stages, botanists can piece together the evolution of a single tree. exactly the same principle applies in astronomy to the study of the life-story of globualr clusters, huge spherical aggregations of about a million stars all swarming about each other.
Q:assumption
a: A the methods of scientists in one field generally carry over to other fields even if the subject matter is vastly different.
c globular clusters at different stages of development are accessable to astronomers for observation and study.
为什么是C不是A。应该怎样去非A呢 |
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发表于 2003-6-4 22:36:00
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