2. 外语
  3. Some greenhouse gases occur naturally in the atmosphere, while others______(由人类的活动造成).

Some greenhouse gases occur naturally in the atmosphere, while others______(由人类的活动造成).

admin2013-05-19  99
问题 Some greenhouse gases occur naturally in the atmosphere, while others______(由人类的活动造成).
选项
答案result from human activities
解析 “由……造成”直接用result from...的主动形式。
转载请注明原文地址:https://kaotiyun.com/show/XEg7777K
0

大学英语四级

相关试题推荐
随机试题
最新回复(0)