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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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
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