【題組】⑵A recent study found that test scores were 6.41 percent higher at schools wherecellphone use is prohibited. The researchers concluded that mobile phones can have anegative impact on productivity through distraction, particularly among low-achievingstudents, who benefitted most from the ban.Many in the pro-technology camp say that students are not distracted if their teachersare engaging, a statement that exasperates soon-to-be former teacher Mandy Hill. Sherecently brought a Holocaust survivor into class to talk about World War II, and noticedthat one of her students was tweeting during the talk. “Should I have told the Holocaustsurvivor to be a little more engaging?” Hill said.（20 分）