A.Humans are natureborn to do so.
B.Humans have the tendency to fight.
C.Humans may find new sources of food.
D.Humans don’t like to stay in the same place.
解析 细节理解题。由第二段第一句话“Perhaps the best answer lies in our genetic makeup (基因构成) as human beings.”和此段最后一句“Perhaps the best reason for exploring space is this genetic tendency to expand wherever possible.可知A项正确。”
3.The underlined word “spinoffs” in Paragraph 4 probably refers to________.
A.survival chances
B.potential resources
C.unexpected benefits
D.physical possessions
解析 词义猜测题。由第四段中的“We have already benefited from other spinoffs including improvements in earthquake prediction,in satellites for weather forecasting and in communication systems.”可推出,此处spinoffs意为“意想不到的好处”。survival chances生存机会;potential resources潜在的资源;unexpected benefits意想不到的好处;physical possessions物质财产,故选C。
4.What makes it possible for humans to live on other planets?
A.Our genetic makeup.
B.Resources on the earth.
C.The adaptive ability of humans.
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