A．inB．betweenC．amongD．in between
A. in
B. between
C. among
D. in between
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As for the issue of whether life ever existed on Mars, the author seems to be ______.
A. confirmative
B. doubtful
C. suspicious
D. cautious
A．ButB．HoweverC．WhereasD．At the same time
A. But
B. However
C. Whereas
D. At the same time
From the missionary's manuscript. we may infer that ______.
A. the great signal drums were very popular there
B. people there were hostile to the European strangers
C. the Amazon River area was densely populated then
D. the tribes along the river were always at odds
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
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