单项选择题

Gauss wanted to establish contact with the Martians by ______.

A．planting trees in triangular shape
B．filling wide ditches with oil
C．building a large mirror
D．making patterns with trees
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单项选择题
The main idea of this passage is that ______.
A．human beings long for an immortal life
B．there are many difficulties in making the Soul Catcher
C．people can live immortally as technology develops
D．the invention of Soul Catcher has great significance
单项选择题
Charles Cross felt ______.
A．angry when the government paid little attention to his ideas
B．pleased when the government did take notice of his plan
C．surprised that the officials were interested in his suggestion
D．disappointed at the lack of interest shown in his plan
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