问题补充：
Not all of the snakes were dangerous. this means .
A. none of the snakes were dangerous
B. all of the snakes were not dangerous
C. few of the snakes were dangerous
D. no snakes were dangerous
答案：
A. none of the snakes were dangerous
(答案→)B. all of the snakes were not dangerous
C. few of the snakes were dangerous
D. no snakes were dangerous
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