叶圣陶先生说过：“心里知道该怎么做，未必就能养成好习惯；必须怎样怎样去做，才可以养成好习惯。”这句话强调了（  ）
①培养好习惯必须要有计划和决心②培养好习惯必须要有实际行动
③培养好习惯必须改掉坏习惯      ④培养好习惯必须把培养好习惯的想法落实到行动中去

“革命声传画舫中，诞生共党庆工农。重来正值清明节，烟雨迷蒙访旧踪”(1964年董必武同志题诗)。诗中“画舫”的所在地是在（    ）

提一桶水上楼，这时手臂上肱二头肌和肱三头肌的状态分别是：（      ）

抛物线y=-x²+bx+c的部分图象如图所示，若y≥0，则x的取值范围是（   ）

      Rose is an American schoolgirl. She is now in Beijing with her parents.
       It's Sunday morning. Rose gets up early in the morning. After breakfast her parents take her to the zoo. They go to see the pandas and other animals. The pandas live only in China. There are not any pandas in America. So they like the pandas best. Outside the zoo gate there is a picture. It's a picture of panda with “welcome”. In the zoo, Rose sees not only panda but also many other animals.
    The panda is round and fat. It looks like a ball. It always moves slowly like a ball rolling. There are also elephants. The elephant is the biggest animal on land. There are many monkeys on the hill. Some of them are sitting in the trees. Some are picking nuts. And the others are running or climbing up the trees. Rose and her parents have a good time in the zoo.