今天小编带来了关于英语四六级知识点分享，希望对大家的学习有所帮助，预祝大家考试顺利。
1.
A. White.
B. Black.
C. Hispanic.
D. American Indian.
2.
A. Signs of increased anger.
B. A clear interest in weapons and violence.
C. Depression or isolation
D. Signs of excitedness.
二、听力文本
A new study suggests that many of the deadly school shootings in the United States over the past 10 years could have been prevented. Most students who carried out such an attack had shown threatening or suspicious behavior, but were not reported to law enforcement, the study found. The study was based on an in-depth examination of 41 incidents of "targeted school violence." All of the attacks happened over a 10-year period from 2008 to 2017. The study found that the shootings took place quickly and often ended within 60 seconds or less. Law enforcement rarely arrived while the attack was happening. Attacks generally started during school hours and happened in a single area, such as a dining hall, restroom or classroom. Most of the attackers were male, but seven were female. Researchers reported that 63 percent of the attackers were white. Fifteen percent were black, 5 percent Hispanic and 2 percent American Indian or Alaska Native. The attackers most often used guns, but knives were sometimes used. Investigators said most of the weapons came from the homes of the attacker. The report identified warning signs that school officials, families and other students could use to help them recognize a possible attacker. These include signs of increased anger, a clear interest in weapons and violence, depression or isolation, self-harm or sudden behavioral changes. The study found most U.S. schools have security cameras as well as planned lockdown measures for shooting situations. However, only 17 percent of the schools had a system in place where students or families can directly contact officials about a student in crisis.
Question 1: According to the news report, which of the following group committed most of the school shootings?
Question 2: According to the news report, which of the following is not mentioned to be helpful for school officials, families and other students to recognize a possible attacker?

三、重点词汇
1. suspicious: making you feel that something illegal is happening or that something is wrong 可疑的，引起怀疑的
2. law enforcement: the activity of making certain that the laws of an area are obeyed 执法
3. Hispanic: connected with Spain or Spanish-speaking countries, especially those countries in Latin America 西班牙（人）的；西班牙语言（文化）的；（尤指拉丁美洲）西班牙语国家的
4. lockdown: a situation in which people are not allowed to enter or leave a building or area freely because of an emergency （建筑或地区）因紧急情况而被封锁了
四、背景知识
美国枪击日历是根据媒体报道统计的美国重大枪击事件中丧生及受伤人员情况。由于历史原因，美国形成了根深蒂固的枪支文化，美国枪击案爆发频率越来越高，枪支暴力事件远超世界上其他发达国家。美国人拥有约2.65亿支枪，每位成年人都有超过1支枪，平均每10天有9天是枪击日。美国枪支暴力档案室网站发布的数据显示，2018年全年，美国共发生涉枪案件57103件，导致14717人死亡、28172人受伤，其中未成年人死伤3502人。
五、参考答案
Question 1: A
Question 2: D