单项选择题

不同的一项是（）

A．knock
B．knowledge
C．kilometer
D．knee

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单项选择题
Landsat 7 knows that Alaskan glaciers have shrunk because ______.
A．sightseers have noted the changes
B．computer-animated views have shown the shrinkage
C．one of the glaciers was hit by a ship
D．the temperatures are much colder
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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