Many experts hold that the forthcoming decline of polar bears is______.
A: directly caused by the diminishing Arctic ice
B: directly caused by the atmospheric buildup of heat-trapping gases
C: a symbol of the weather change
D: absolutely based on the emission of heat-trapping gases
A: directly caused by the diminishing Arctic ice
B: directly caused by the atmospheric buildup of heat-trapping gases
C: a symbol of the weather change
D: absolutely based on the emission of heat-trapping gases
举一反三
- uildup of heat-trapping greenhouse gases
- Scattering is the change in the direction of electromagnetic energy caused by ( ). A: Particles suspended in the atmosphere B: Water droplets C: Large molecules of atmospheric gases D: Dust
- Global climate change mainly refers to global warming caused by the increase of ( ). A: Harmful gases B: Noble gases C: greenhouse gases D: Air pollutants
- 9) It (inevitably) will increase the emission of carbon dioxide and so hasten the buildup of greenhouse gases in the atmosphere. A: unavoidably B: certainly C: accidentally
- A ______ refers to an injury caused by heat, fire or radiation, etc.