Choose A, B, C, or D that best completes eac...

Câu hỏi: Choose A, B, C, or D that best completes each sentence. Carbon dioxide is released through _______  processes such as respiration and volcano eruptions and through__________activities such as deforestation, land use changes, and burning fossil fuels.

A. natural / human

BHuman / human

CMan-made / ordinary

DOrdinary / man-made

Câu hỏi trên thuộc đề trắc nghiệm

Kiểm Tra - Unit 6 !!