Kate's father took her to the hospital to see her one-day-old baby brother. They drove there straight from school. Kate had never been inside a hospital before.  ①This was a new experience for her.

    At the gate there was a large sign listing all the departments of the hospital, with arrows (箭头) showing how to find them. When Kate saw the A&E department(急救室), she asked,“What do those letters stand for?”“Accident and emergency,” replied her father,

②“Last spring, I took our sister there because she fell off her bike,”

有学者认为“就世界大势论，鸦片战争是不能避免的。”这里所说的“大势”是指(      )

下面提供了四则信息：①低温技术已有重大突破，随着低温技术的发展，科学家一定能制取到内能为零的物体；②某科研小组正在研制一种使光速大大降低的介质，不久的将来，能使光速降到40m/h左右，慢到跟乌龟爬行的速度相仿；③由于太阳的照射，海洋表面温度可达30℃左右，而在海洋100m～600m深的地方，水温约4℃，因此人们研制了一种抗腐蚀的热交换器，利用水温差发电，并取得了成功；④随着机械制造水平的提高，人们正在研制机械效率为100%的机械，并取得重大突破．

请根据学过的物理知识辨别，以上信息中正确的是（  ）