①他简直像棺材里倒出来的，就像我想像里的僵尸，骷髅上绷着一层枯黄的干皮，打上一棍就会散成一堆白骨。____

②我吃惊地说：“啊呀，老王，你好些了吗？”____

③他……直着脚往里走，对我伸出两手。____

④但不知为什么，每想起老王，总觉得心上不安。____

若数轴上A、B两点所对应的有理数分别为a、b，且B在A的右边，则a﹣b一定（　　）

阅读短文，完成下列问题

Dear Jenny,

   How are you? I am visiting my cousin Howard in Australia. It is hot in Hong Kong but it is cold in Australia in June. When it is summer in Hong Kong, it is winter in Australia. It is snowing heavily now. I like snow a lot and it is a white world outside. I will play with my cousin in the snow this afternoon. We want to make a snowman. I think it is very interesting!

   I like my cousin's house. It is big and there is a beautiful garden（花园）. We can play ball games. My cousin's neighbors are friendly but they cannot speak Chinese. I talk with them in English.

   See you next month.

 Tony

细菌分裂n次，会形成2n个细胞。