According to the passage, sending people to Mars is ______.
A. economically possible
B. technologically feasible
C. out of scientific incentive
D. all of the above
查看答案
A．is brokenB．will breakC．will be brokenD．will have broken
A. is broken
B. will break
C. will be broken
D. will have broken
The everyday objects recorded and collected by the successors to the first explorers may reveal ______.
A. where these objects came from
B. how they rotted in a tropical climate
C. a glimpse of the Incan civilization
D. the vicissitude of Amazon cultures
According to the passage, the practice of installment ______.
A. was adopted by manufacturers
B. made consumer credit easier
C. promoted consumers' expectations
D. ultimately led to materialism
A．has been conceivedB．had been conceivedC．have been conceivedD．were conceived
A. has been conceived
B. had been conceived
C. have been conceived
D. were conceived
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