某个命题的结论是“实数a，b都不大于2”，如果用反证法证明，正确的反设为_1

题干

某个命题的结论是“实数a，b都不大于2”，如果用反证法证明，正确的反设为____

上一题下一题 0.0难度选择题更新时间:2011-05-31 11:12:55

实数a，b至少有一个大于2

某调查组到社会上进行环境污染问题的调查，设计了下列调查表。请你根据调查表内容说说如何做好学校环境保护方面的工作。

Kinds of pollution	air pollution, water pollution, noise pollution and litter.
Results	The environment on the earth is becoming worse and worse.

要求：短文要求正确、流畅；词数80个左右。

提示词：keep……clean and tidy, clean, sweep, throw rubbish into the dustbins,

plant, so that, protect, speak highly of, make a contribution to doing

There are many kinds of pollution around us, such as air pollution, water pollution, noise pollution and litter.……