Documentary evidence supports claims that ______ the New World about AD 1000.
A.reached the Vikings
B.the Vikings reached
C.reaching the Vikings
D.the Vikings that reached
Why does the author say that the evidence just partly supports the theory?
A.Because what the theory suggests is only plotted by economists.
B.Because the negative relationship since 1980s is against the theory.
C.Because baby-boomers concerned the relationship is the other way around.
D.Because what the theory suggests may be a coincidence.
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