B.spaceships have been sent up to Mars since 1960s
C.people have had a better knowledge of Mars nowadays
D.all the water on Mars has been gone for ten billion years
57.The MAVEN spacecraft has been launched with the purpose of________
A.assisting Curiosity in studying the geology of Mars.
B.analyzing the change of the atmosphere on Mars
C.checking whether water still exists on Mars
D.analyzing what is contained in Mars’air
58.What do we know about MAVEN according to the text?
A.It weighs almost as much as a small school bus.
B.It is scheduled to go into orbit in December 2017.
C.It is the second spacecraft to study Mars’atmosphere.
D.It will explore Mars’atmosphere with eight different tools.59.It can be inferred from,the text that__________.
A.more wonderful things about Mars will be found in the future
B.more spacecraft will be sent up to Mars from now on
C.many different tasks will be given to MAVEN when it lands on Mars
D.many spacecrafts are working around Mars to get more information
60.What is the best title of this text?
A.A new discovery on Mars
B.A new spacecraft sent to Mars
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