Who says dogs don't need to wear beautiful clothes? My dog Michael has many different kinds of1, and he likes them a lot. Look at him in the picture! He is2 a grey hat, a yellow shirt and red shoes today. And he also wears a3 of sunglasses. You look so4, Michael! I design clothes for Michael.It takes me a lot of free time, 5 I enjoy it. All of Michael's clothes are made 6good cotton. And they 7 him very well. Every time I take Michael out for a 8 in the park, I can hear people saying, “Oh, look at that dog. How fashionable he looks!” I'm very happy about it. It 9 that Michael is already a star. Walk for today, Michael. What? You want to play with the ball? All right, let's go! Oh, 10me! I'm putting on my sneakers.

“爷爷的怪脾气”这一作文题目的关键词是(    )。

下列关于病毒的叙述不正确的是（　　）

阅读理解：引入新数 $i$ ，新数 $i$ 满足分配律，结合律，交换律，已知 $i^2=-1$ ，那么 $(1+i)·(1-i)=$ ____．