问题
单项选择题
设a•b1（modr）已知a，求b，称求a对于模r的乘逆b，称a、b对r（）。
A、互为乘逆
B、互为乘法
C、互为余数
D、互为质数
答案
参考答案：A
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设a•b1（modr）已知a，求b，称求a对于模r的乘逆b，称a、b对r（）。
A、互为乘逆
B、互为乘法
C、互为余数
D、互为质数
参考答案：A
Once, there was a wild donkey (驴) and a tame (驯养的) donkey. The wild donkey was thin and small. He spent his life in the ____. The grass on the hill was his food all the year around. Sometimes, he had to walk miles to find clean water and at night there was always ____ from lions. The tame donkey was much fatter and ____. During summer, the owner fed him grass while in ____, he was given corn and hay (干草) to eat. There was always clean water for him to ____ and at night he stayed inside safely. The wild donkey always wished he could live ____ the tame donkey. One day, the wild donkey was looking for grass on the hill. Looking down, he saw the tame donkey walking slowly along the road, ____ heavy wood. As he watched, the tame donkey stopped to eat some ____ by the roadside. Suddenly, his owner began to drive him with a ____. “I don’t want your way of life,” thought the wild donkey. “I see that you have to pay ____ for the food they give you.”
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