Of course this has not stopped the flow of bright ideas for communicating with the supposed people on Mars. In the early nineteenth century the great mathematician Gauss suggested planting tree patterns in Siberia, so that the Martians would see them and replay suitably. Following up this idea, the Austrian scientist Karl Littrow proposed digging very wide ditches(沟) in the Sahara, triangular in patterns, and then filling them with petrol or some substance so that, when lit, the ditches would present Martian observers with a “flaming triangle” which would show the existence here of intelligent minds. Even better were the plans of Charles Cross, a French writer of the 1870’s, who wanted to build a large mirror to reflect the sun’s rays and concentrate them on the surface of Mars, thereby making a vast burning–glass. By swinging the mirror around, Cross explained it would be practicable to write words in the Martian deserts simply by burning the sand. For many years he bombarded (鼓吹) the French government with literature about this plan and was very disappointed when no official interest was shown.
69.From the passage we can learn that the opinion of the writer is that
.
A.people on the earth are almost certainly the only intelligent beings in the universe
B.people on the earth are definitely the only intelligent beings in the universe
C.there may be other intelligent beings in the universe
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