阅读理解

    “We are good mothers,” I said to my friend, as we sat on our comfortable beach chairs under our beach umbrella and watched our children playing in the waves.

    Out of nowhere, the children took off running. About fifty yards from us, a man—maybe in his fifties—was fishing. The children stood next to him and watched with their little mouths hanging open as he cast the fishing lines. He smiled at them. They ran back to us—all except my three-year-old daughter, Drew.

    My heart beat fast with horror. “Drew! Come here! Play with your friends!” I shouted, very aware that my speeches about not talking to strangers weren't working. It seemed that many parents heard of horrible stories about children being taken away by strangers. Responsible mothers should teach their children that the world is a dangerous place. So I felt relieved when Drew ran towards me and took hold of a shovel (铲子). Then she looked me in the eye: “I want to be with the person.”

    Again, she approached the middle-aged man, and started digging next to him.

    Several seconds later, she returned, waving something shiny.

    “Look, Mommy! A toy fish!”

    It was, indeed, a toy fish—yellow and rubber. This must have been what he was using to attract the fish. And he'd given it to Drew. The three other children were deeply impressed, and they didn't try to hide how jealous(妒忌的)they were—clearly, they all wanted the fish.

    “My friend gave me that fish!” Drew shouted loudly. The sand in front of the umbrella turned into a preschool cage match with a yellow rubber fish flying through the air. I felt like I might cry myself.

    Unexpectedly, there he was: the man, standing right next to us with three more rubber fish in hand. He handed them to each of the children. By their faces, you would have thought he was actually the really kind big brother.

    “Thank you,” I said, realizing that there is good and kindness in strangers.

小轿车以20m/s的速度在平直公路上匀速行驶，司机突然发现正前方有个收费站，经10s后司机才刹车，使车匀减速运动10s恰停在缴费窗口，缴费后匀加速到20m/s后继续匀速前行．已知小轿车刹车时的加速度为2m/s²，停车缴费所用时间为30s，启动时加速度为1m/s²．

下列物质属于纯净物的是(   )

材料一：英国初等教育伴随着工人阶级的斗争而发展，为缓和阶级矛盾，英国给予了工人一些受教育的权利。19世纪下半叶，英国已经完成工业革命，技术革新要求工人受到更多的教育，其他资本主义国家逐渐与英国开展经济竞争，工人运动也日益激烈。1870年，英国政府出台了《初等教育法》（又称《福斯特法案》），进行强迫初等教育，标志着国民初等教育制度正式形成。1876年教育法规定，家长有义务送子女入学。1880年教育法将实施义务教育的年龄定为5-10岁。1891年教育法规定实施免费初等教育。1899年教育法又将义务教育的年龄提高到12岁。到1900年，基本上普及了初等教育。

材料二：自明治维新以来大为兴办小学教育，随着资本主义经济的发展和社会近代思想水准的不断提高，小学教育日益普及，就学率不断上升。1873年小学就学率只有28.1%，1890年达到50%，到1905年达到96%。1919年以后均为99%。日本自明治维新以来，不足半个世纪就实现了国民教育的普及，对资本主义发展起了很大的作用。

材料三：在维新派中，严复是中国最早的较系统地介绍西方资本主义文化思想的先驱人物。他创办了北京通艺学堂、上海复旦公学等学校，从事教育工作二十年。他翻译了斯宾塞的《德育、智育、体育》-书，译名为《劝学论》。他是首先在我国传播西方资本主义德、智、体三育并重教育的维新主义者。严复认为改良中国的社会，自强图存，保种保国，主要应从三个方面着手，“今日要政，统于三端，一日鼓民力、二日开民智，三日新民德”，就是要使国家三强：“血气体力之强、聪明智虑之强、德行仁义之强”。