760：刚考完，狗狗+附自己整理的阅读寂静+语法资料

远方的树

恭喜楼主，加油

sherry0912

ecogo 发表于 2014-7-8 18:07
就是你想的那样啦~

可是为什么我试了一下觉得条件（1）是可以的呀..不是说X>Y+1么~谢谢楼主啦~

joannaqly

up ~~                                                                     

handsome1013

好人~~~~~~

truedream1

谢谢！！！！！！

ciciwenwen

附上楼主说的那个GWD:
Charcoal from a hearth site in Colorado, 2,000 miles south of Alaska, is known to be 11,200 years old.  Researchers reasoned that, since glaciers prevented human migration south from the Alaska-Siberia land bridge between 18,000 and 11,000 years ago, humans must have come to the Americas more than 18,000 years ago.
Which of the following pieces of new evidence would cast doubt on the conclusion drawn above?
A.        Using new radiocarbon dating techniques, it was determined that the charcoal from the Colorado site was at least 11,400 years old.
B.        Another campsite was found in New Mexico with remains dated at 16,000 years old.
C.        A computer simulation of glacial activity showed that it would already have been impossible for humans to travel south overland from Alaska 18,500 years ago.
D.        Using new radiocarbon dating techniques, it was proved that an ice-free corridor allowed passage south from the Alaska-Siberia land bridge at least 11,400 years ago.
E.        Studies of various other hunting-gathering populations showed convincingly that, once the glaciers allowed passage, humans could have migrated from Alaska to Colorado in about 20 years.

附上大家的讨论：http://forum.chasedream.com/thread-421991-1-1.html

crystalgaoya

感谢lz～～～～

流氓会武术

TristanLiu

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echoqian1217

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