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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：
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解答：
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提问：
没思路...只知道avg mean大于median 说明更多的房子销售价格是大于median的中位数的...位于median之后的数值的和要大于median之前数值的和...？
解答：
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提问：
请帮助求解！
解答：
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