单项选择题

When did the Neanderthals extinct

A．More than 30,000 years ago.
B．After 30,000 years ago.
C．Before about 35,000 years ago.
D．Some 13,000 to 14,000 years ago.
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单项选择题
What' s the weather like in the Arctic region of European Russia more than 30,000 years ago
A．Moderate temperature, relatively dry and ice -free.
B．Extremely cold, relatively dry and ice- free.
C．Extremely cold, plenty of raining and ice- free.
D．Extremely cold, relatively dry and ice frosted.
单项选择题
By referring to Sam' s broken bicycle, the author intends to ______.
A．illustrate the ways to repair his bicycle
B．discuss the problems of his bicycle
C．tell us how to solve a problem
D．show us how to analyze a problem
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