老张、老王、老李、老赵是好朋友，一天，他们四人碰面，每两人都握一次手，他们一共握了多少次手？（先画一画，再解答．）

    Some friends are playing hide-and-seek (捉迷藏) at Mr. Green’ home. They play in Mike’s room. It’s time for Lily to find her friends. Lily first finds Sally.Sally is behind the door. Then, Lily sees Bob. Bob is under the table. Mike is under the table, too. Now it’s time to find David and John. David’s hat is on the sofa. Is David under the sofa? No, he isn’t.John’s schoolbag is on the chair, but he isn’t there.“Where are they?”Lily thinks.Shh! Don’t let her know. They are under the bed!

“沧海桑田”的主要原因是人类的填海选陆活动．

小林同学在一个正方形盒子的每个面都写有一个字，分别是：每、天、进、步、一、点，其平面展开图如图所示，那么在该正方体盒子中，和“每”相对的面所写的字是（   ）