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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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
单项选择题
The police station asks for public help because ______.
A．ordinary people like the television programme
B．ordinary people are interested in pictures of paintings, jewellery, etc.
C．the policemen can not catch the thieves themselves
D．ordinary people may help the policemen get useful information about the criminals
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