单项选择题
New data has ______ that the damage to the ozone layer is not confined to the southern hemisphere.
单项选择题 I've never ______ the theory that people are more important than animals.
单项选择题 Efforts to reach the injured men have been ______ because of a sudden deterioration in weather conditions.
单项选择题 I don't understand why people ______ such a beautiful garden with cans and bottles.
