36.According to the passage, the chief purpose of explorers in going to unknown places in the past was .
A) to display their countrys military might C) to find new areas for colonization
B) to accomplish some significant science D) to pursue commercial and state interests
阅读能力的提高包括很多因素,文章可以分为段落,段落可以分为句子,句子可以分为单词。
37.At present, a probable inducement for countries to initiate large-scale space ventures is .
A) international cooperation C) scientific research
B) nationalistic reasons D) long-term profits
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 , 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
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