单选题 The beam that is ______ by a laser differs in several ways from the light that comes out of a flashlight.

【正确答案】 A

【答案解析】[解析] 本句的主干谓语动词为differs，主语为beam，而that引导的为beam的后置定语从句。根据搭配，应该是laser放射的光线，emit“发出，放射”；transport“运输，流放”；motivate“激发”；translate“翻译”。故答案为A。