Moving to a new place may be an exciting adventure.____ If you have a friend experiencing this anxiety, there are some steps you can take to make him feel more at home. Talk to your friend about his homesickness.____ This also gives you the option to share with him any strategies you have personally discovered to help overcome these feelings.

    Join your friend in discovering and adapting to the new environment. It is human nature to fear the unknown. By learning to deal with the new environment, your friend will find it easier to overcome the desire for what is familiar.

    Introduce him to new friends by including him in your social circle. These new relationships help relieve the feelings of homesickness and keep his mind off those friends he left behind.____ For example, if he likes sports and being outdoors invite him to go hiking or camping with you and your friends.

____ Developing a new schedule will help him change things to where he does not need his old routine. Perhaps get him involved in an athletic club where he can boost endorphins(内啡肽) by keeping physically fit.

    Keep a positive outlook. Encourage him to see the glass half full so he can embrace this new experience instead of longing for what once was. Being positive helps your friends become more positive, so make the most of your influence____

A. However, there are many ways to overcome it.

B. Burying it will only make his homesickness worse.

C. Invite him to clubs that you know he will enjoy.

D. Help him develop a new routine to replace the old one.

E. You will help him keep an active attitude to life if you are positive.

F. He could be homesick due to missing family dinners every night

G. However, following that is the anxiety that comes from a change in routine.

已知向量 $\overrightarrow{a}$ =（m，4）， $\overrightarrow{b}$ =（3，﹣2），且 $\overrightarrow{a}$ ∥ $\overrightarrow{b}$ ，则m=____．

第20届世界杯足球赛将于当地时间2014年6月12日至7月13日在巴西境内12座城市举行。读图1、图2、图3，回答问题。

生物体遗传信息的中心是（　　）