题目内容：
How long did it take for a letter sent by a post rider to reach the addressee between New York and Boston?参考答案：
答案解析：
简答题：How long did it take for a letter sent by a post rider to re
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根据听到的内容，回答题。What is the main problem caused by the usual way
根据听到的内容，回答题。What is the main problem caused by the usual way of plowing?A．The cr
All chains can offer students the same type of course in dif
All chains can offer students the same type of course in different places.
·offers the most easily tuned radio?
·offers the most easily tuned radio?
第47题的正确答案是_____________.
第47题的正确答案是_____________.
原植物鉴定的步骤如下（ ）
原植物鉴定的步骤如下（ ）