相差1的两个素数是______和______，它们的最大公因数是______．
相差1的两个素数只有2和3，它们的最大公因数是1．
故答案为：2、3；1．
The country itself didn't have enough gas, so the government decided to _______ its gas supplies to other countries. [ ]
A. cut away
B. cut off
C. cut down
D. cut out
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