单项选择题
A．no other country can make one like it B．it is much cheaper to operate C．it is more sophisticated than Landsat 7 D．Terra will show energy gains
A．images taken with a Polaroid camera B．the latest images taken by a government satellite C．a television camera D．astronauts
A．sightseers have noted the changes B．computer-animated views have shown the shrinkage C．one of the glaciers was hit by a ship D．the temperatures are much colder