单项选择题

The author's primary concern is to demonstrate that ______.

A．Leif Erikson did not visit America
B．Biarni might have visited America before Leif Erikson
C．Biarni did not visit Wineland
D．Leif Erikson visited Wineland first

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单项选择题

According to the passage, Wineland was characterized by which of the following geographical features

A．Woods only.
B．Hills only.
C．Woods and hills only.
D．Flat rocks and hills only.

单项选择题

The author mentions the two high mountains in order to show that it is ______.

A．reasonable for Biarni to land precisely at his father's home
B．possible to sail from Norway to Greenland without modern navigational equipment
C．likely that Biarni landed on America at least 100 years before Leif Erikson
D．probable that Leif Erikson followed the same course as Biarni