如图所示的一组实验可用于研究燃烧条件．其中能够说明“可燃物燃烧需要温度达到着火点”的一组现象是（　　）

①图1铜片上白磷燃烧           ②图1铜片上红磷未燃烧

③图1水中白磷未燃烧           ④图2水中白磷燃烧．

①将铁钉放入硫酸铜溶液中；

②向硫酸亚铁溶液中滴入几滴双氧水；

③将铜丝放入氯化铁溶液中．

   A pretty, well-dressed young lady stopped a taxi in a big square, and said to the driver, “Can you see that young man at the other side of the square?”
   “Yes,” said the taxi-driver. The young man was standing outside a restaurant and looking impatiently at his watch every few seconds.
   “Take me over there.” said the young lady.
   There were a lot of cars and buses and trucks in the square, so the taxi- driver asked, “Are you afraid to cross the street.”
   ‘Oh, no !” said the young lady. “But I said that I would meet that young man for dinner at one o’c1ock, and it is now a quarter to two. If I arrive in a taxi, it will at least seem as if I have tried not to be too late.”

下列有关自然环境保护的说法中错误的是（　　）