题目

Summer is a great time to hit the beach, but a few East Coast beach goers have recently had their fun in the sun turned into a nightmare. In July alone, there have been at least five known shark attacks at Carolina beaches. Although shark attacks are actually quite rare, these animals still inspire fear in ocean waters. 【1】Skip feeding time.【2】 Of course, an attack can happen at any hour of the day or night, but nighttime and its transitions are statistically the worst times to be in the water. It is believed that the lack of visibility during these hours makes it easier for the sharks数学谜语：（1）考试不作弊------ （猜数学名词）；（2）八分之七------ （打一成语）．