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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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