如图所示，挂在弹簧测力计下的铁块置于一个匝数可变的电磁铁的上方。当开关S与1接通稳定后测力计的示数为F₁，使滑动变阻器的滑片P向左移动到某一位置，弹簧测力计的示数为F₂，则F₁____ F₂；然后滑片P的位置保持不变，开关由1接到2，稳定后弹簧测力计的示数为F₃，则F₃____ F₂。(选填“=”、“>”或“<”)

为了让一切创造财富的源泉充分涌流，造福于民，我们必须（     ）

 ①落实科学发展观，积极构建社会主义和谐社会             ②尊重劳动、尊重知识、尊重人才、尊重创造 

 ③坚持以公有制为主体、多种所有制经济共同发展         ④做到发展为了人民、发展依靠人民、发展成果由人民共享     

把每组中不是同一类的词语画出来。

①昙花  牵牛花  花钟  万寿菊  夜来香   ____

②蜂蜜  骆驼   金鱼  花鸭   蝴蝶   ____

③膀  手臂   脊背  双腿  身高   ____

阅读短文，从方框中选择适当的单词填空。

Some people in Britain and America like to invite friends to dinner at home. But this is more common in America ____ in Britain. Don't worry if your English friends don't invite you home. It doesn’t mean that ____ don't like you.
When you are invited to an evening dinner, ask your friends what ____ you should arrive. It is a good idea to take a small present when you arrive, and it is ____ to say how much you like the house, the room, or the pictures in the room. But don't ask how much these things cost. In this way, ____  you and your friends will have a pleasant get-together.