NO.PZ2015122802000029
问题如下：
You own shares of a company that are currently trading at $30 a share. Your technical analysis of the shares indicates a support level of $27.50. That is, if the price of the shares is going down, it is more likely to stay above this level rather than fall below it. If the price does fall below this level, however, you believe that the price may continue to decline. You have no immediate intent to sell the shares but are concerned about the possibility of a huge loss if the share price declines below the support level. Which of the following types of orders could you place to most appropriately address your concern?
选项：
A.
Short sell order.
B.
Good-till-cancelled stop sell order.
C.
Good-till-cancelled stop buy order.
解释：
B is correct.
The most appropriate order is a good-till-cancelled stop sell order. This order will be acted on if the stock price declines below a specified price (in this case, $27.50). This order is sometimes referred to as a good-till-cancelled stop loss sell order. You are generally bullish about the stock, as indicated by no immediate intent to sell, and would expect a loss on short selling the stock. A stop buy order is placed to buy a stock when the stock is going up.
考点：Execution Instructions
这道题就是说现在价格是每股30元，技术分析得到该股票的阻力位是27.5元（通常跌倒27.5元就会反弹）。但是如果股票真的跌破阻力位就会出现巨大亏损，投资者目前还不想卖股票，但他也担心出现跌破阻力位的情况，所以应该发布什么指令呢?
A就是一个正常的以市场价格卖空的指令，但题干明确说除非大跌投资者并不想现在就卖。
B:投资者现在拥有股票，希望在未来股票价格跌破27.5时卖出止损，这就是good-till cancelled stop sell order的作用，stop order是一个有效性指令，当价格触碰27.5才会执行卖出指令
C:stop buy不能解决投资者的顾虑，因为他持有股票担的是股票下跌而不能及时止损，而选项C是通常是卖空方用来止损的指令。
错题本上的这题我看不明白，short position 为了止损不应该是stop buy吗，为啥选C limit buy，解析看的更糊涂
