Scientists have also discovered that atoms can help them make the worlds atomic clocks even more accurate.These clocks are so accurate today they would only lose one second six million years! Such accuracy will help us travel in space because distance is velocity times time.Withthe long distances involved in space , we need to know time as accurately as possible to get accurate distance.
51.A.opened B.occurred C.opposed D.operated
52.A.Earth B.space C.planet D.star
53.A.whether B.where C.what D.when
54.A.foods B.beds C.tools D.suits
55.A.wind B.energy C.system D.rays
56.A.education B.status C.knowledge D.location
57.A.reasonable B.wonderful C.impossible D.necessary
58.A.above B.below C.within D.beyond
59.A.invention B.theory C.paper D.experiment
60.A.convincing B.begging C.ordering D.forcing
61.A.and B.though C.but D.so
62.A.will B.would C.must D.can
63.A.ultra-small B.ultra-fast C.ultra-hot D.ultra-cold
64.A.any B.each C.every D.some
65.A.travel B.research C.walk D.station
答案:BBADC DCABA DBDCA
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