2015年9月3日,我国隆重举行纪念抗日战争胜利70周年阅兵仪式,展示中国军队的风采。新中国诞生前后,中国人民解放军进一步发展壮大,其标志是(    )

阅读短文，回答问题。
    Rose's summer holiday is coming soon. Her family loves to go on trips in summer. Last summer, she went to a lake with her parents. She swam in the lake and played on the beach.
    This summer she will go on a trip to the sea with her grandfather and grandmother. She will swim in the sea. She will watch the ships on the sea. She will be happy for the summer holiday.

下列常见的物质中，属于纯净物的是 （   ）

动画片“猫和老鼠”深受儿童喜爱，下列能正确表示猫和老鼠的基本结构层次的是（    ）

判断对错

两位数乘一位数的积，一定比三位数乘一位数的积小。