声音简介
The word “proliferation” in the passage is closest in meaning to
○Growth
○Cooperation
○Importance
○Success
The coastal hypothesis suggests an economy based on marine mammal hunting, saltwater fishing gathering, and the use of watercraft. Because of the barrier of ice to the east, the Pacific Ocean to the west, and populated areas to the north, there may have been a greater impetus for people to move in a southerly direction.
The word impetus in the passage is closest in meaning to
○chance
○protection
○possibility
○incentive
注意:原文单词可能和正确选项意思完全不一样,但是上下文意思相近
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