A．问题
1．One of the biggest problems facing the world today is global warming.
当今世界所面临的最大问题之一是全球变暖。
2．As we all know，the global water shortage is becoming increasingly severe mainly due to global warming.
众所周知，主要由于全球变暖，全球水资源短缺问题正变得日益严重。
3．There is no doubt that the earth is becoming warmer and that it is human activity that has caused this global warming.
毫无疑问，地球正变得更加暖和，全球变暖正是人类活动所致。
4．In order to avoid traffic jams，I strongly suggest some effective measures be taken.
为避免交通拥堵，我强烈建议采取一些有效的措施。
