雅思阅读真题模拟练习
本系列的模拟试题在难度、长度、题材、题型方面都与雅思考试近似的练习。这些练习,均以国外报刊上的文章为素材,按雅思阅读的题型,出题并提供答案及简单注释。欢迎大家积极使用。
Solar-panel fold failure may mean extra spacewalk
Fold failure
The retraction of a six-year-old solar array on the International Space Station did not go to plan on Wednesday. Ground controllers left it only partly folded while they consider their options for getting the device pulled back fully. The problem may mean the crew of the space shuttle Discovery has to undertake a fourth spacewalk.
We dont want to rush into a fix of a problem that just occurred, says John Curry, Discoverys lead flight director. As a result, Thursdays spacewalk to tackle other jobs will proceed as planned, without a fix to the solar array.
Beginning at 1328 EST on Wednesday, ground teams and the astronauts inside the ISS attempted to fold one side of the 35-metre P6 solar array back into a box on the top of the ISS. This needed to be done so a newer P4 solar array can freely rotate to track the Sun without colliding with its neighbouring array.
After almost 6.5 hours of trying to get the array to retract and more than 40 remote-control commands sent to the array, only 13 and a half of the arrays 31 segments were safely folded in the box.
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