A、Santa Barbara. B、Fort Bragg. C、San Francisco. D、New York. A由新闻可知，胡德堡、宾厄姆顿、奥罗拉、奥克里克、纽敦、海军制造厂、圣塔芭芭拉、查尔斯顿、圣贝纳迪诺等许多地方都曾遭受过群体枪击事件。故

(3) Three years ago, after 20 children and 6 adults were shot dead at a school in Connecticut, President Obama said he would do all in his power to prevent similar mass shootings in the future by tightening gun control. In his final year in office, Mr. Obama is trying again, this time bypassing political opposition by using his executive powers. He set out his plans in an emotional speech at the White House surrounded by family members of people killed in some of the massacres that have taken place during his presidency. (4) Fort Hood. Binghamton. Aurora. Oak Creek. Newtown. The Navy Yard. Santa Barbara. Charleston. San Bernardino. Too many. The President emphasized he respected The Second Amendment rights to bear arms but he said he was determined to act.
3. What effort will Obama make in order to prevent mass shootings?
4. Which place have suffered from the massacres?