阅读：六级四十天突破—讲义与笔记(26)
C) scientific research
D) long-term profits
注：对应文章第三段，B和D相反都排除
38. What is the main goal of sending human missions to Mars?
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" (Line 1, Para.4), 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
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