My parents expected too much of me. When

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问题选择题

My parents expected too much of me. When they heard that I had failed in the college entrance

examination, they almost ____. [ ]

A. broke up

B. broke off

C. broke out

D. broke down

答案

答案：D

解答题

在数列{a_n}中，a₁=1，数列{a_n}的前n项和S_n满足nS_n+1-（n+3）S_n=0．

（Ⅰ）求a₂；

（Ⅱ）求a_n；

（Ⅲ）若b_n=（n+1）²（n∈N），T_n=（-1）^a₁b₁+（-1）^a₂b₂+…+（-1）^a_nb_n，n∈N，求T_n．

问答题简答题

腰椎间盘突出症的推拿的治疗目的是什么？并至少介绍一种为达到其治疗目的的手法。