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【单选题】
1976年3月8日陨落在吉林的“吉林1号陨石”是（）
A.
石陨石
B.
玻璃陨石
C.
铁陨石
D.
石铁陨石
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【单选题】People once widely believed that intelligent life existed on Mars．The 19th-century discovery of what appeared to be geometric designs cut across the surface was taken as evidence．The lines were though...
A.
Because the surface of Mars seemed to be geometric.
B.
Because the lines were drawn across the surface of the planet.
C.
Because a system of canals was thought to be there.
D.
Because it was the Martians that built the canals.
【单选题】For centuries, explorers have risked their lives venturing into the unknown for reasons that were to varying degrees economic and nationalistic. Columbus went west to look for better trade routes to t...
A.
To find out if life ever existed there.
B.
To see if humans could survive there.
C.
To prove the feasibility of large-scale space ventures.
D.
To show the leading role of science in space exploration.
相关题目：
【单选题】People once widely believed that intelligent life existed on Mars．The 19th-century discovery of what appeared to be geometric designs cut across the surface was taken as evidence．The lines were though...
A.
Because the surface of Mars seemed to be geometric.
B.
Because the lines were drawn across the surface of the planet.
C.
Because a system of canals was thought to be there.
D.
Because it was the Martians that built the canals.
【单选题】For centuries, explorers have risked their lives venturing into the unknown for reasons that were to varying degrees economic and nationalistic. Columbus went west to look for better trade routes to t...
A.
To find out if life ever existed there.
B.
To see if humans could survive there.
C.
To prove the feasibility of large-scale space ventures.
D.
To show the leading role of science in space exploration.
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