When imaginative scientists first suggested the possibility that one person could speak directly to another over a long distance, few people took them seriously.
【单选题】Task 2 What can dogs do? Word tips: sniffer dog(用于探查毒品和炸药的)嗅探犬 e.g. The police used sniffer dogs to hunt down the criminals. imitate v. 模仿 (copy) e.g. When one company has an innovative product, othe...