2. 外语
  3. When red is X, green is Y. When green is not Y, blue is Z. But blue is never Z as long as red is X. Therefore which one of these

When red is X, green is Y. When green is not Y, blue is Z. But blue is never Z as long as red is X. Therefore which one of these

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问题 When red is X, green is Y. When green is not Y, blue is Z. But blue is never Z as long as red is X. Therefore which one of these statements is correct?
(a)While blue is Z, green is Y.
(b)While red is not X, blue is not Z.
(c)While green is not Y, red is not X.
选项 A、 
B、 
C、 
答案C
解析 (a)说法与题目中“When green is not Y，blue is Z”不相符。根据题目条件，如果“red is not x”，则“green is not Y”，则“blue is z”，故(b)说法错误。排除法选(c)。
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