The aerial photographs taken last year indicate that ______.
A. there did exist liquid water on Mars
B. a drainage channel was cut deeply by Martians
C. there isn't any life on Mars
D. water had flew on Mars for hundreds to thousands of years
查看答案
A．inB．betweenC．amongD．in between
A. in
B. between
C. among
D. in between
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
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