单项选择题

Landsat 7 knows that Alaskan glaciers have shrunk because ______.

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

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热门试题

单项选择题

NASA can tell that vegetation is growing back because of ______.

A．a bright, white light that is reflected
B．little tiny trees that are growing
C．vegetable gardens that are planted
D．a light, pinkish view from space

单项选择题

Terra will be a better satellite because ______.

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