单项选择题

A．Man will probably be able to live there in 200 years.
B．Scientists are rather pessimistic about it.
C．Man will probably be able to live there in 100,000 years’’ time.
D．Scientists are optimistic about overcoming the difficulties soon.
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单项选择题
A．Hurry to the conference.B．Skip the conference.C．Take the subway.D．Take a bus.
A．Hurry to the conference.
B．Skip the conference.
C．Take the subway.
D．Take a bus.
单项选择题
It can be inferred from the text about the Native American inhabitants of Ungava Bay that they
A．were immunologically defenseless against measles
B．could scarcely ward off the fatal attack by the 1952 epidemic
C．were the last native people to be struck by a virgin-soil .epidemic
D．didn’’t come into frequent contact with White Americans until the 20th century
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