A. when B. which C. how D. what
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A. while B. moment C. time D. period
A) merely B) always C) mainly D) almost
A. merely
B. always
C. mainly
D. almost
A. off and on B. back and forth C. up and down D. far and wide
According to the passage, what effect does industrialized countries\' using a lot energy cause？
A. The levels of carbon monoxide rise.
B. The levels of carbon dioxide rise.
C. The focus of pollution moves to the home.
D. The world's natural resources are unequally shared.
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