[問題]考古題 CR FORM 18 Q5

[amyliang]

考古題 CR FORM 18 Q5
Whenever the sun is shining and the windchill factor is below zero, Susan wears her parka,. Whenever it is raining and the windchill factor is above zero, Susan wears her raincoat. Sometimes it rains when the sun is shining.
If the above statements are true, which of the following must also be true?
(a) if it is not raining and Susan is wearing her parka, the sun is shining.
(b) If the windchill factor is below zero and Susan is not wearing her parka, the sun is not shining.
(c) If the windchill factor is below zero and it is not raining, Susan is wearing her parka.
(d) If the windchill factor is below zero and it is raining, Susan is wearing her raincoat.
(e) If it rains while the sun is shining and the windchill factor is zero, Susan wears her parka.
The answer is B
Why???????能否解說一下題目 再告知我為什麼 謝謝

[scujean]

題目翻譯：
當太陽照耀+wind-chill factor <0 , Susan 穿他的毛皮外套。當在下雨+ wind-chill factor >0, Susan 穿他的雨衣。有的時候太陽照耀和下雨會同時存在。

解釋wind-chill factor ：The effect that wind has on our perception of cold is called the [highlight=yellow]wind chill factor[/highlight]. The greater the wind speed, the faster we lose body heat.

解題：
1.wind-chill factor<0 →以F[sup]-[/sup]表示
wind-chill factor>0 →以F[sup]+[/sup]表示

not rain→ ~rain , not wear raincoat→ ~raincoat
not shine→ ~shine , not wear parka→ ~parka
2.依題意，可得到：
一. sine+F[sup]-[/sup]→ parka
二. rain+F[sup]+[/sup]→ raincoat

3.選項以代號表示
(a)~rain +parka→ shine
(b)F[sup]-[/sup]+ ~parka→ ~shine
(c)F[sup]-[/sup]+ ~rain → parka
(d) F[sup]-[/sup]+rain → raincoat

(e) shine+rain+ F→parka
只有(B)左右移項後變成F[sup]-[/sup]+ shine →parka，符合題意中的第一個。

注：左右移 項時，~shine 會變成shine ；~parka變成parka

[yvowne]

請問像A得到B或A加B得到C這種邏輯題目
可以把兩邊選項左右移項，正負號改變就好??
然後請問為什麼可以這樣呢??
謝謝^^

題目翻譯：
當太陽照耀+wind-chill factor <0 , Susan 穿他的毛皮外套。當在下雨+ wind-chill factor >0, Susan 穿他的雨衣。有的時候太陽照耀和下雨會同時存在。

解釋wind-chill factor ：The effect that wind has on our perception of cold is called the [highlight=yellow]wind chill factor[/highlight]. The greater the wind speed, the faster we lose body heat.

解題：
1.wind-chill factor<0 →以F[sup]-[/sup]表示
wind-chill factor>0 →以F[sup]+[/sup]表示

not rain→ ~rain , not wear raincoat→ ~raincoat
not shine→ ~shine , not wear parka→ ~parka
2.依題意，可得到：
一. sine+F[sup]-[/sup]→ parka
二. rain+F[sup]+[/sup]→ raincoat

3.選項以代號表示
(a)~rain +parka→ shine
(b)F[sup]-[/sup]+ ~parka→ ~shine
(c)F[sup]-[/sup]+ ~rain → parka
(d) F[sup]-[/sup]+rain → raincoat

(e) shine+rain+ F→parka
只有(B)左右移項後變成F[sup]-[/sup]+ shine →parka，符合題意中的第一個。

注：左右移 項時，~shine 會變成shine ；~parka變成parka

[ariesmichael]

請問有人知道其他錯誤選項分別錯在哪裡嗎?