“Remembering situations when communications failed puts__a_pit_in_my_stomach，” Mr Russo says.Last summer，he was in a search at a beach for a missing boy，who went into a bathhouse but didn’t come out.First responders feared an abduction (绑架) on the beach or shark attack.The child’s mother，who didn’t speak English well，was so sad that she couldn’t remember what color shorts he had on.Mr Russo had no photo of the child，and no ability to turn to beachgoers.

　　Two long hours later，the boy was spotted by a low­flying helicopter lost and alone on the beach crying—a lucky break.“If 5 percent of beachgoers had an app to receive a message and send in sightings of a lost boy，the happy ending might have come much sooner，” Mr Russo said.

　　5．What is the passage mainly about?

　　A．A system for reporting emergencies.

　　B．A moving story of Chris Russo.

　　C．A cellphone instant service.

　　D．An app for firm management.

　　6．The underlined part in Paragraph 4 can be replaced by “________”．

　　A．arouses my interest

　　B．causes a stomachache

　　C．makes me feel frustrated

　　D．leaves a hole in my stomach

　　7．We can infer from the passage that emergency workers________.

　　A．have to carry out rescue work in minutes

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