are absorbed after they enter the aerosphere (大气层), still a few can (60) the ground.
The geomagnetic storm caused by this round of solar storm reaches its highest level on the two (61) of the earth, which affects electricity supply of North America. Overexposure to (62) threatens the health of passengers on planes flying over the Polar Regions. If we fly in the sky during such a solar storm, it (63) we receive ten times the X-ray radiation. Its really damaging.
Scientists say a solar eruption is like the sun sneezing, which will make the earth (64) a cold. Though this natural force is irresistible, scientists can still (65) its movement accurately by monitoring. Facing successive solar storms, humans cant drop their guard
51 A.since B.when C.until D.though
52 A.finds B.adjusts C.holdsD.takes
53 A.intensity B.height C.width D.density
54 A.piece B.part C.round D.set
55 A.star B.earth C.moon D.sun
56 A.dominate B.develop C.damage D.descend
57 A.safe B.dangerousC.comfortable D.manageable
58 A.limit B.cause C.force D.threat
59 A.separate B.benefit C.distinguish D.protect
60 A.lose B.reach C.break D.prepare
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