在中国近代化的进程中，下列口号或主张出现的先后顺序是（    ）

①自强与求富 ②维新变法 ③民主共和 ④民主、科学

下列叙述正确的是（    ）
①使用酸性的洗发液可以更好地去除头发上的油脂，使头发更健康
②在蚊虫叮咬处，涂抹氢氧化钠溶液，以减轻痛痒       
③人体健康时，胃液的pH一般在0.9～1.5范围内，
④在冬天，我们教室内因含有较多的二氧化碳，要适当开窗通风
⑤长期饮用蒸馏水对人体健康有益

如图4—6—1所示，用酒精灯给烧杯加热，使烧杯内的水保持沸腾，则插在烧杯中的试管里的水( )

    Jane always goes to school early. She likes to talk to her friends before class. After school she does not go home early. She is always late. Jane stops to see the animals in the pet shop. She likes to see the dogs. One of them is a little dog. She watches the little white dog play in the window of the shop. She watches for a long time, so she comes home late.

    One day her father and mother ask why she is late, and she tells them about the little dog in the pet shop.

    Jane is not late the next day. She stops to look in the window of the shop. But she doesn't see the little white dog, and she is very sad. She is also very happy, today is her birthday.

    Mother shows her a big birthday cake and Father gives her a birthday surprise. He gives the little white dog from the shop. Jane is very happy. The next day Jane does not come home late. She runs home to play with the white dog.