已知实数$a,b,c$满足$c<b<a$，且$ac<0$，那么下列不等式一定成立的是（  ）

请以L形的三格骨牌为基本图形，在图2和图3中各设计1个轴对称图形．要求如下：

a、每个图形由3个L形三格骨牌组成，骨牌的顶点都在小正方形的顶点上．

b、设计的图形用斜线涂出，若形状相同，则视为一种．

关于国家利益、集体利益和个人利益的关系，下列说法中错误的是（　）

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。

    I had a school trip last May Day. We spent ____ first four days in Paris. We had a sightseeing of the city, and we ____ (visitor) some of the famous places ____ the Eiffel Tower and the Louvre. From Paris we traveled down to the south of ____ (French) near Marseilles by boat. We spent ____ (fifth) days there. There we had a lot of ____ (funny). We swam in the sea，and we took a lot of ____ (picture). We also did lots of sports ____ the beach. We went back a week ____ (late) by train. I think the trip was interesting. I like the food best. It was ____ (deliciously).