Directions: Read the sentence below. It gives the main idea of the passage. Choose the THREE answer choices that give (important) ideas from the passage. Some answer choices are not correct because they are minor ideas in the passage or because the ideas are not in the passage.
A.
Remote sensing photography at altitudes above 500 feet is not very useful.
B.
Infrared photography and digital imaging have enhanced the value of remote sensing photography.
C.
The use of remote controlled airplanes is more popular than the use of conventional airplanes.
D.
Aerial photography is the oldest and most common form of remote sensing.
E.
Synthetic Aperture Radar is a useful remote sensing technique.
F.
Synthetic Aperture Radar can be used without flying above the site.