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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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阅读329744
提问：
求解
解答：
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阅读403922
提问：
有个洗车行，洗一辆车是 8 块，一个天能挣 200 元。然后打算加价，但是每增加 0.5块，就会减少 10 个顾客，问公式表达收入。答案有 200+(p-8)*0.5/10; 200+(p- 8)*10/0.5; 200-(p-8)*0.5/10 之类的。
感觉上面的答案不对
解答：
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阅读403962
提问：
机经课上没有讲的几何
解答：
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阅读404028
提问：
请问
解答：
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阅读404422
提问：
请教老师
解答：
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阅读404975
提问：
请问老师
解答：
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阅读408219
提问：
请问老师
解答：
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阅读411301
提问：
请问
解答：
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阅读412617
提问：
请问
解答：
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阅读414628
提问：
请问
解答：
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阅读424883
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