问题
选择题
Take bus No. 3 and get off _____________ the _____________ stop.[ ]
A. at; four
B. at; fourth
C. in; fourth
答案
答案：B
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Take bus No. 3 and get off _____________ the _____________ stop.[ ]
A. at; four
B. at; fourth
C. in; fourth
答案：B
2 SO3（g），则当反应达到平衡后