A.they are both winners of awards
B.they are both experts in spatial thinking
C.they both abandon verbal description
D.they both use various instruments
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A.benefited a lot from their mathematical knowledge
B.shed light on disciplined school management
C.was brought about by privileged home training
D.owed a lot to the technological development
A.The Atmosphere and Our Environment
B.Research on Radiation
C.Effects of Space Radiation
D.Importance of Protection Against Radiation
A.the Apollo mission was very successful
B.protection from space radiation is no easy job
C.astronauts will have deformed children or grandchildren
D.radiation is not a threat to well-protected space explorers
A.exposure to even tiny amounts of radiation is fatal
B.the effect of exposure to radiation is slow in coming
C.radiation is avoidable in space exploration
D.astronauts in spacesuits needn' t worry about radiation damage
A.Much though
B.Though much
C.Much as
D.As much
A.Whatever
B.Whichever
C.What
D.However
A.spacious
B.suspicious
C.gracious
D.merciful
A.infinite
B.finite
C.innumerable
D.numerous
A.whenever
B.how
C.no matter how
D.although
A.what
B.that
C.which
D.whose
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