16. The passage describes, in broad terms,.
A)a number of disadvantages related to earth dams
B)the advantages of various types of dams
C)the differences between the various types of dams
D)the technical features of an earth dam
E) common features of dams
17. According to the passage, the function of sluices in an earth dam is to_______ .
A) prevent any escape of water
B)provide support for the cut-off wall
C)direct the flow of incoming water
D)maintain a regular supply of water in the reservoir.
E) leak wter when needed
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