题目

Taking a math test can be pretty stressful. Even if you know the material, you can still get the problem wrong. ___16___ Therefore you’ll improve your grades, as well as your math skills. Write it out You can also check a math problem by writing everything out on paper. ___17___ Writing out math problems reduces your chances of missing anything to the lowest possible level, which is a common cause of incorrect answers. ___18___ Make sure your answers work by doing the opposite procedure of what your problem calls for, including the answer you got the first time around. In other words,6．概括下面语段内容。（不超过15个字）    对于胸怀大志的创业者，世博会的滋养和熏陶改变了他们的人生轨迹。18岁的诺贝尔参观了1851年伦敦世博会，对科学的向往压倒了对文学的迷恋；布鲁秦尔和鲁赛尔就是在1851年伦敦世博会上结识后，敲定了建造“大东方”号巨轮的方案；从斯德哥尔摩赶到费城参加1876年世博会的安德鲁受到美国飞行家怀斯的启蒙，成了瑞典热气球航行均先驱；幼年的福特因随父亲参加1876年费城世博会而爱上机械，1893年他专程奔赴芝加哥世博会并见到戴姆勒的汽车后，激发了一生中最重要的灵感。