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.
39. By saying With Mars the scientific stakes are arguably higher than they have ever been , the author means that _________________.
A) with Mars the risks involved are much greater than any previous space ventures
B) in the case of Mars, the rewards of scientific exploration can be very high
C) in the case of Mars, much more research funds are needed than ever before
D) with Mars, scientists argue, the fundamental interests of science are at issue
注:争议太多,对应末段
40. The passage tells us that proof of life on Mars would _______________.
A) make clear the complex chemistry in the development of life
B) confirm the suggestion that bacterial fossils traveled to Earth on a meteorite
C) reveal the kind of conditions under which lie originates
D) provide an explanation why life is common in the universe
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 the Orient and to promote the greater glory of Spain. Lewis and Clark journeyed into the American wilderness to find out what the U.S. had acquired when it purchased Louisiana, and the Appolo astronauts rocketed to the moon in a dramatic show of technological muscle during the cold war.
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