单项选择题

Which of the following is NOT true about prehistoric humans at the time of the mammoths' extinction

A．They were relatively few in number.
B．They knew how to use bows and arrows.
C．They were concentrated in a small area.
D．They were skilled hunters.
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单项选择题
The work to stamp out smallpox was made more difficult by______.
A．people's unwillingness to report cases
B．the lack of vaccine
C．the backwardness of the region
D．the incessant local wars
单项选择题
Which of the following conclusions about mammoths does the passage support
A．Humans hunted them to extinction.
B．The freezing temperatures of the Ice Age destroyed their food supply.
C．The cause of their extinction is not definitely known.
D．Competition with mastodons caused them to become extinct.
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