Most of the global warming observed over the past 50 years is attributable to human activities. ( )
举一反三
- Global warming observed over the past century has focused attentionon mantled greenhouse gas，presumed to be the likely cause．
- Global warming is caused by human activities except the greenhouse effect.（ ）
- In the past 50 years, there ________ a great increase in the amount of research _____ on the human brain.[1分]
- Do you think that these higher-than-average temperatures are attributable to global warming?<br/>A A: responsible for B: related to C: caused by
- According to some scientists, global warming the survival of the whole human race.