A. Wildlife
B. Biodiversity
C. Challenge
D. Investigation
A. broke up
B. broke into
C. finished off
D. ended up
A. under the weather
B. out of the blue
C. out of order
D. down to earth
A. If
B. Were
C. Should
D. Had
A. didn’t I come
B. don’t I come
C. you didn’t come
D. I hadn’t come
A. who
B. whose
C. which
D. whom
A. The/ x/ the/ x
B. The/ a/ the /x
C. an/ a/ the/ x
D. the/ the/ the/ x
A. must be taken away
B. must be ended
C. must be allowed
D. must be followed
A. must be given
B. shouldn’t be given
C. mustn’t be given
D. can be given
A. cover
B. provide
C. make up for
D. compensate for
A. agriculture
B. major
C. fresh
D. aquatic
A. when natural-resource shortages increase in the features of gradually increasing demands from a rising human population.
B. when a natural resource crosses political borders
C. when freedom could destroy the resource.
D. when eroded soil and silt cloud affect many organisms.
A. Argument often surrounds how a resource should be used, or allocated, and for whom.
B. A river may provide water for agricultural irrigation, habitat for fish, and water-generated electricity for a factory
C. Conservation methods are incidental to care for the river for future use.
D. Farmers, fishers and industry leaders vie for open access to this river.
A. Conservation conflicts
B. Agricultural irrigation
C. The headwaters of a major river
D. Natural-resource shortages
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