[ Aptitude : Height and Distance ]
The angle of elevation of the sun, when the length of the shadow of a tree 3 times the height of the tree, is:
A. 30º
B. 45º
C. 60º
D. 90º
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A. Who
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Sudden changes in water temperature can ________ mass killings of fish, plants, or amphibians.
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There are three pictures ____ the wall.
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