①小红家在小明家的北面，小兰家在小明家的南面。

②小军家在小红家的西面，小华家在小红家的东面。

③小兰家在小芳家的东面。

④剩下的一个地方是小强家。

如图所示的电路中，电源电压恒定。闭合开关S后，电路正常工作。过了一会儿，两电表的示数突然都变大，则该电路中出现的故障可能是（）

下列二次根式中，属于最简二次根式的是（       ）

阅读短文，根据短文内容判断正误，在括号内写正确或错误。

    I'm Chinese girl. My English name is Lily. I like English very much. I can speak(说) some English now. I have a good friend. Her name is Ann. She has long hair and blue eyes. She's from America. This is my classroom. It's not big, but it's nice and clean. There are twenty-four desks and chairs in it. They are new. I like my classroom very much.

心脏内的瓣膜使血液按一定方向流动，血液流动的方向是（    ）