不懂这题的逻辑，求解！ Kernland imposes a high tariff on the export of unprocessed cashew nuts in order to ensure that the nuts are sold to domestic processing plants. If the tariff were lifted and unprocessed cashews were sold at world market prices, more farmers could profit by growing cashews. However, since all the processing plants are in urban areas, removing the tariff would seriously hamper the government’s effort to reduce urban unemployment over the next five years. Which of the following, if true, most seriously weakens the argument? A. Some of the by-products of processing cashews are used for manufacturing paints and plastics. B. Other countries in which cashews are processed subsidize their processing plants C. More people in Kernland are engaged in farming cashews than in processing them. D. Buying unprocessed cashews at lower than world market prices enables cashew processors in Kernland to sell processed nuts at competitive prices. E. A lack of profitable crops is driving an increasing number of small farmers in Kernland off their land and into the cities.

@Tina老师，老师，这道题帮忙讲一下b和c选项呗。主要区别在谓语单复数和后面的to provide 还是providing。主语是两个不可数名词and并列，谓语要用复数么？

@陆旭老师 我想问一下 这里面的数字7是哪里来的呀？我想了一下排除0和它本身应该还有8个呀，不是很明白。

@陆旭老师 为什么这道题选b呀？我把（1）代进去能求出答案，把（2）代入则x=5与题目要求不符，求讲解。谢谢

@陆旭老师 这道题思路是什么呀？应该怎么做呢？

这道数学题 我想问问数学老师为什么我的两个方法答案都不对 首先 我理解这道题是问事件M或者R只发生一个的概率 我的第一个方法就是用M发生*R不发生+M不发生*R发生 这样哪里出错了 需要怎么改呢？ 我的第二个方法是用总体减去M和R同时发生的概率再减去M和R都不发生的概率，这里哪里出错了 要怎么改呢？ 谢谢老师的回答！

@英吉老师 我想问一下这道题A选项错在了哪里，算是犯了什么错误？

@英吉老师 这一道题里的c选项还是不是很明白哪里错了，请问这句话要是怎么改就算对了呢？

@徐小梅老师，徐老师您好，第4)题，我也看到了“至少2人”这个字眼，也是按照至少2人来算的。但我是这么理解的：原来男女共有12个人，先从5个女生中取2个人，保证了至少有两个女生，所以是C5^2; 接着，再让剩下的3个女生和7个男生合并，共10人，取3个人（此时不论男女都可以），是C10^3。然后合起来就是C5^2*C10^3。

为什么4）不能直接用C5^2 *C10^3?先从5个女生中选2人，再从剩下的10人中选3。这样我算出来的是1200。但是按照图片上老师的方法算的是596。很疑惑，求老师解答一下，谢谢！

为什么分子是5 就一定有一个分母是2的三次方有一个分子是1呢？