Twospacewalkersfixedacameraontheoutsideoftheinternation...

问题详情：

Two space walkers fixed a camera on the outside of the international space station on Monday and threw overboard a data – collecting device （装置）, sending it rolling off into space like a football. The new camera will help space station astronauts add new pieces onto the orbiting（轨道）station.

Mr. Arthur and his Russian crewmate left the or biting station unmanned during the 5 – hour spacewalk. Normally, one crew member stayed aboard while two others worked outside. But the space station crew has been reduced to two since the space shuttle Columbia disaster in 2003, and it has been left empty nine times during spacewalks since then.

The device thrown overboard was once used to collect data on electrical activity around the space station. It was designed to work for only a few months and was no longer needed. Engineers were afraid pieces might break off and damage the space station, so they decided to cut it loose. The device, which weighs about 60 pounds and has solar panels that extend about 2 feet, is expected to burn up in the atmosphere in about three months.

Happily, the space walking pair helped each other into their spacesuits without the help of a third crew member. The space walk was put off by an hour because of trouble with the US airlock（气密过渡舱）, which did not depressurize （减压）completely at first. But the pair quickly made up for the lost time as they worked outside. It was the first time in two years that space walkers exited through the US airlock.

1．Why did the spacewalkers leave the orbiting station unmanned?

       A．They were busy fixing a camera.

       B．They had to throw a data – collecting device.

       C．They had to stay aboard.

       D．The space station crew has been reduced to two due to an accident.

2．According to the scientists, the device thrown overboard would          .

       A．return to the earth

       B．burn up in space in about three months

       C．be recycled and reused

       D．stay in outer space for a long time

3．The astronaut McArthur and his Russian crewmate           .

       A．put on their spacesuits with the help of each other

       B．worked outside of the space station with a third crew member

       C．put off the spacewalk to repair the US airlock

       D．were the first spacewalkers to exit through the US airlock

4．When the spacewalking pair carried out their task,         .

       A．they got the help from the new camera

       B．they put off the task as they planned

       C．they reduced their work as they worked outside

       D．they finished their work as they planned despite a delay at the beginning

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