(A) Water vapor in the air
(B) Carbon dioxide emissions
(C) Sulfur dioxide and nitrogen oxides in the air
(D) Ozone layer depletion
(A) Water vapor in the air
(B) Carbon dioxide emissions
(C) Sulfur dioxide and nitrogen oxides in the air
(D) Ozone layer depletion
(A) Breeze
(B) Wind
(C) Storm
(D) Cyclone
(A) Peak
(B) Summit
(C) Bottom
(D) Long
(A) They produced heat and often burned out.
(B) They consumed a lot of electricity.
(C) They were larger in size
(D) The operation cost was high.
(A) Water pollution
(B) Air pollution
(C) Noise pollution
(D) Soil pollution
(A) Wilhelm Rontgen
(B) Albert Einstein
(C) Willem Einthoven
(D) Sigmund Freud
(A) Issac Newton
(B) Galileo Galilei
(C) Kepler
(D) Einstein
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