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
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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
单项选择题
Silt and heavy run-off from farms in North Carolina were caused by ______.
A．Hurricanes Irene and Floyd
B．Hurricanes Floyd and Carla
C．an eruption from a volcano
D．deforestation of trees
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