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

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热门试题

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

单项选择题

Landsat 7 shows how changes have occurred on land by sending back ______.

A．images taken with a Polaroid camera
B．the latest images taken by a government satellite
C．a television camera
D．astronauts