单项选择题

In analyzing a problem we should do all the following except ______.

A．recognize and define the problem
B．look for information to make the problem clearer
C．have suggestions for a possible solution
D．find a solution by trial or mistake

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单项选择题

Who were those toolmakers

A．Neanderthals.
B．Modern humans.
C．Archaeologists.
D．Not determined.

单项选择题

What is the significance of the discovery

A．It shows that modem humans lived in the Arctic more than 3,000 years ago.
B．It shows that Neanderthals lived in the Arctic more than 3,000 years ago.
C．It shows the oldest documented evidence for human presence at such high latitude.
D．It shows human could use tools 30,000 years ago.