(46)
mountains and valleys carved by
(47)
glaciers and rivers rushing and rumbling deep underground.
In a report on the analysis of the Martian pictures Dr.Michael Car of the U.S.Geological Survey comments: “I am convinced
(48)
lots of water on Mars.” Any surface water will be in the
(49)
of ice.But it could save explorers from
(50)
to take so much
(51)
with them.
The report says
(52)
Mars probably had a warmer climate in ages
(53)
due to its axis (轴) having been more tilted (倾斜) towards the sun.
(54)
signs of plant or animal life have been detected by instruments landed on Mars,
(55)
the landing vehicles have been sent there for a few years.’s
B.there’re
C.here’s
D.here’re
49.A.appearance
B.way
C.form
D.shape
50.A.have
B.having
C.carry
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