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[Issue Essay]
试题详情
题目：
Analytical!
选项:
答案:
提问：
For some birds the sense of smell appears to paly a role in navigation, since pigeons with surgically removed olfactory nerves ( were found to have increased difficulties ) in homing.
A. were found to have increased difficulties
B. have been found to have increased difficulty
C. were found to have increasing difficulty
D. had been found to have increased difficulties
E. have been found to have increasing difficulties
答案是B，我选的A。不明白为什么要用现在完成时，而且感觉困难应该是复数。麻烦老师讲解。
解答：
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提问：
If 500 is the mutiple of 100 that is closest to x and 400 is the multiple of 100 that is closest to y，which multiple of 100 is closest to x+y？ （1）x小于500 （2）y小于400
解答：
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提问：
老师 32题不懂怎么解，都是看过答案解释还没懂的！
解答：
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提问：
老师28题解答这里怎么是60的12次方，5的1次方？怎么化简化的？
解答：
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提问：
老师，这道题做错了，不会，怎么解啊？谢谢！
解答：
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提问：
May老师这道OG上的题没懂，即使看了下面的解释。谢谢哦！
解答：
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提问：
求may老师解答
解答：
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提问：
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解答：
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提问：
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解答：
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提问：
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解答：
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提问：
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解答：
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