Beaver Alex and Beaver Betty send each other messages using the following sequence of transformations on every word.
海狸亚历克斯和海狸贝蒂通过以下对每个单词进行的一系列变换来互相发送消息。
For example, the word "BEAVER" is transformed to "WBFCSF".
例如，单词“BEAVER”被转换成了“WBFCSF”。
Beaver Betty receives the encoded message "PMGEP" from beaver Alex.
海狸贝蒂收到了海狸亚历克斯发来的加密信息“PMGEP”。
Question: 问题:
What did Alex want to say?
亚历克斯想说什么？
A. LODGE
B. RIVER
C. FLOOD
D. KNOCK
Explanation 解释
Correct answer is FLOOD. The steps of the transformation, applied in the reverse order, are:
正确答案是 FLOOD。逆序应用的转换步骤为：
“PMGEP” → “OLFDO” → “DOOLF” → “FLOOD”
That is:
那就是:
- Replace each letter with the previous in the alphabet;将每个字母替换为字母表中紧挨着它前面的那个字母；
- Shift letters by 2 to the right;将字母向右移动两位；
- Reverse the word. 把单词倒过来。
The other answers are not correct.其他答案都不正确。
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