补写出下列名篇名句的空缺部分。
①____，则芥为之舟。置杯焉则胶，____。（庄子《逍遥游》）
②____，斜光到晓穿朱户。____，独上高楼，望尽天涯路。（晏殊《蝶恋花》）
③望长安于日下，____。地势极而南溟深，____。（王勃《滕王阁并序》）
④天之于物，____，故其在乐也，商声主西方之音，____。（欧阳修《秋声赋》）
⑤莫唱当年长恨歌，____。____，泪比长生殿上多。（袁枚《马嵬》）
下列有关调查动物种群密度方法的叙述，正确的是( )
下列几组数能作为直角三角形的三边长的是（ ）
解分式方程：1x-3+2x-1x+3=2．
Mrs. Green doesn't like sports. She has much work to do at home. Her mother is coming this afternoon and she goes to meet her. Near the school she looks at her watch. She has some time. So she goes into the school. Her son isn't in the classroom. She asks a boy and knows they're behind the school. She sees some boys playing there. Her son is there too. She watches them playing and soon she's angry. She takes her son to the wall. “Go home with me, Richard.” She says, "Don't play with them. I can buy a nice ball for you. Then you don't need to scramble for the ball."
