【简答题】This passage is primarily about______. [A] the greenhouse effect [B] the burning of fossil fuels [C] the potential effect of air pollution [D] the likelihood of a new ice age
【简答题】Directions: Fill in the blanks with the capitalized letter before the words like A, B, C or D. A. animals B. automatically C. changing D. chemical E. covered F. episodes G. fundamental H. offer I. pro...