根据图中通电螺线管的N、S极，在图中标出磁感线的方向和电流方向．

Woman：Can I help you ?

Anna：Yes, please .I need a new pants for school.

Woman：Ok. What colour do you want?

Anna：Blue.

Woman：How about this one?

Anna：It looks nice. How much are they?

Woman：They are fifty-four yuan.

Anna：I'll take it. How much are those yellow shoes?

Woman：Thirty-five yuan.

Anna：Great! I'll take them.

Woman：Here you are.

Anna：Thank you!

Woman: You're welcome.

一天，小鹰、小鸭、小鹿在河边发现了一箱水果，它们决定把这箱水果拖到动物俱乐部去。小鹰想从天上飞过去，就用力往天上拉；小鸭想从水里游到目的地，就往水里拉；小鹿则想走大路，就往路上拉。结果是水果箱一动也不动。这启示我们，要实现集体的目标，就要做到（     ）