题目

Teens are busy people. They balance high school and friends; some add jobs and extracurricular(课外的) activities to the mix.  36  Involve your teen with a variety of activities from your life and relate them to your teen’s experiences.Large project 37  Create a timeline for the project, such as making holiday cards. Take family pictures in November. Continue by designing and then ordering cards. Purchase stamps and envelopes, assemble cards and mail by your deadline.StorageInclude your teen in organizing items for storage in a closet or basement.  38  Sort your clothes and boo14．已知数列{an}的通项公式为${a_n}=\left\{\begin{array}{l}-n，\;n≤4\\ \sqrt{{n^2}-4n}-n，\;n＞4\end{array}\right.（n∈N*）$，则$\lim_{n→+∞}{a_n}$=（　　）A．-2B．0C．2D．不存在