What is the central idea of the above passage?
A. Dynamic features of Mars
B. Efforts for exploration of the Martian atmosphere
C. Benefits of Themis space probe system
D. Flight software upload to the Spirit and Opportunity rovers
Answer:B
What is the central idea of the above passage?
A. Dynamic features of Mars B. Efforts for exploration of the Martian atmosphere C. Benefits of Themis space probe system D. Flight software upload to the Spirit and Opportunity rovers