21．Who saved Bob’s life?

　　A．His friend．

　　B．His neighbor．

　　C．His son．

　　D．His dog．

　　22．What was the reason for Bob’s slipping?

　　A．He seldom went out at night．

　　B．He didn’t wear proper shoes．

　　C．It was too dark to see clearly．

　　D．The weather was freezing cold．

　　23．What can be learned about Bob from the story?

　　A．He was shy in public．

　　B．He liked playing football．

　　C．He lived all by himself．

　　D．He got on well with neighbors．

　　B

　　Seven years ago，back in 2010，some reports covered a story that the world’s longest railway tunnel was under construction in Switzerland．At that point it had already been under construction for over a decade．It had been voted to be built nearly a quarter of a century ago!The idea to build it could date back to nearly 70 years ago—about as old as some of your grandparents!

　　Yesterday，it was finally ready!

　　It’s 35 miles long and runs 7，5 00 feet beneath the Swiss Alps，a famous mountain range in Switzerland．It even runs under an old tunnel that was there before．It took a total of 17 years to build at a cost of $12 billion 128 million tons of rock were dug．Two million truckloads of earth were removed!

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