过去人们认为大气污染只影响工厂密集、交通繁忙的大城市周围地区。现在我们懂得虽然这些地区空气污染最严重,但这一问题实际上却是全球性的。燃烧煤和油使大气里的二氧化碳成份增加,这就带来了温室效应,使世界平均气温上升。
39 Several years decades ago, people Now,
Today, Why do people ?
has such change taken place?
39.1 Several years ago, people were often a little surprised when they heard that a college student was doing a part-time job. Why? Maybe he is short of money, they thought. Nowadays, it is not an uncommon occurrence that college students are working as tutors, salesmen and tour guides. Many students put up advertisements on bulletin boards or lamp posts to search for odd jobs. Why do many students show great interest in a part-time or a summer job?
几年前,人们听到某某大学生在打工,常会觉得有点惊奇。他们想:怎么啦?他可能缺钱用吧?但如今大学生兼做家庭教师或推销员、导游是常有的事了。许多学生在招贴栏或路灯杆上贴广告,想寻找一份短工。为什么许多学生对课余打工或暑假打工这么感兴趣呢?
39.2 Several decades ago, early childhood was spent playing games on the streets. To acquire academic skills at early ages was not encouraged. But now there is an increasing awareness of the importance of learning in the early years. Failure to teach children when they are young is seen as evidence of bad parenting. Hence education begins at increasingly earlier ages. Children are now presented both at home and in kindergarten with formal instruction in reading and math once reserved for primary school students. Why has such a big change taken place?
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