Directions: In this section, there is a passage with ten blanks.
37、Questions37-46 are based on the following passage.
Fire, scientists agree, helped give rise to a successful, thriving human population by providing heatfor cooking and protection from the cold.
But they don't agree36 __ when humans began using fire. Some researchers argue that it 37 __ more than a million years ago when early humans made their way to Europe from Africa, and others say it happened much later. Now, a new study argues that humans did not 38 __ fire until about 400,000 years ago.
Two archaeologists in the US report their39 __ in the current issue of the proceedings of the National Academy of Sciences. The pair looked at excavation (发掘 ) reports and studies from 141 sites in Europe that were between 1.2 million and 35,000 years old. They think there is no clear evidence of 40 __ fire use until about 400,000 years ago. In Africa, while there are several sites where there was evidence of fire, those may have been41 __ fires that occurred in the African grassland.
Yet there are sites older than 400,000 years in Europe that indicate the42 __ of humans, with the oldest, in Spain, more than a million years old. This means that despite Europe's extreme winter climates, early humans found a way to 43 __ without the warmth of a fire. As the researchers mention, early humans are adaptable and persistent. But some researchers maintain that it is still a puzzling explanation and it still44 __ some serious thinking about how early the human being could have survived on a seasonally variable food45 __ despite having small teeth and small guts. Up to now, none has solved this problem yet.
A. acquire
B. authentic
C. demands
D. exactly
E. eventually
F. findings
G. habitual
H. investigations
I. master
J. natural
K. occurred
L. presence
M. skillful
N. supply
O. survive
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