命题“∃x₀∈（0，+∞），lnx₀=x₀﹣1”的否定是（　　）

先化简，再求值：2(a＋ $\sqrt{3}$ )(a－ $\sqrt{3}$ )－a(a－6)＋6，其中a＝ $\sqrt{2}$ －1.

B.根据短文内容及首字母提示完成短文（每空一词）
   Recently a lot of people have been punished for speaking on their mobile phones while driving. S____  on the phone requires concentration(集中，专心) and takes a driver’s   a ____  from the road.If you drive after you have consumed alcoholic(含酒精的) drinks, you are  a____  the law and risking your own life as well as the lives of  o____  . If you are with someone else who has been drinking alcohol, even  i____  they had just a glass of beer, do not  a____  them to drive.
   There is a fact that driving too fast through city streets is very irresponsible and  d____  . Our city streets are always  b____  with people, cars and bicycles. Drivers have to take the responsibility(责任) to be c____  for people crossing the road, especially older people who may walk s ____  and young children who may not look before stepping into the road.

植物的蒸腾作用能增加大气的湿度，这说明（    ）