四、閱讀測驗【請依照段落上下文意，選出最適當的答案】
Ten years ago, most experts would have agreed that the first people in the Americas arrived about 14,000
years ago by walking across a land bridge that crossed the Bering Strait—the boundary between Siberia and
Alaska. They then traveled south through an open area of ground between great sheets of ice that stretched
across North America at that time. Today, however, this theory is being challenged.
An alternative theory suggests that instead of a single first migration, various groups of people came to the
Americas at intervals spaced well apart in time. Another theory proposes that, rather than walking across a land
bridge, some came by boat. According to this theory, ancient people might have kayaked their way along the
shoreline just as adventurous tourists do today.
Looking at ancient tools found in America, archeologist Dennis Stanford noticed that their shape is
analogous to tools used by the Solutrean culture of southwestern Europe. He thinks it is conceivable that people
of that culture may have kayaked across the Atlantic from Europe to America perhaps 20,000 years ago or
earlier.
The science of archeology often produces theories that are based on very small bits of evidence. Today’s
archeologists know that being stubborn and holding on to one theory while shutting out the others isn’t good
science. They know they need to be patient as more buried pieces of the puzzle are dug out of the ground. As
new evidence is discovered that disrupts existing theories, they adjust those theories to explain the new facts.
【題組】28. How many theories are mentioned in this reading?
(A) Two
(B) Three
(C) Four
(D) Five
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