[单项选择]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

[单项选择]What is the characteristic of the Martian surface according to observations over the past 20 years
A. Remaining stable all the time.
B. Appearing bright red.
C. Looking dark most of the time.
D. Changing from bright to dark or vice versa.

[单项选择]The Martian surface temperature is 100 degrees below zero at night, so that butter put outside will not ______.
A. thaw
B. dissolve
C. melt
D. fuse

[单项选择]How to talk to a Martian is an academic question.
A. a theoretical
B. an educational
C. a scholastic
D. a general

[单项选择]

Text 2 After a shaky start, the Martian flotilla that has arrived over the past few weeks is getting down to business. Two of the five craft in it seem to be working perfectly. Two are lost. And a fifth is sick, but undergoing treatment. The most spectacular pictures so far have been provided by Mars Express, the European Space Agency’s contribution to the fleet. On January 28th this reached its final working orbit (which takes it over both poles, and thus allows it to see the whole of Mars over the course of a few days as the planet revolves beneath it). It has, however, been sending back data since shortly after it arrived, and a few days ago its controllers released a series of beautiful photographs, including a stereo image of Valles Marineris, a huge canyon that may have been formed by flowing water. The most scientifically significant result, though, has come from Opportunity, America’s second Mars rover. One of Opportunity’s cameras has photographe
A. "the layers"
B. "wind-blown deposits"
C. "volcanic eruptions"
D. "the terrestrial rocks"