1.

Six roads lead to a country. They may be indicated by letters X, Y, Z, and digits 1, 2, 3. When there is a storm, Y is blocked. When there are floods, X, 1, and 2 will be affected. When road 1 is blocked, Z also is blocked. At a time when there are floods and a storm also blows, which road(s) can be used?

A. Only Y
B. Only Z
C. Only 3
D. Z and 2
Answer» D. Z and 2


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