美化自然，就要爱护身边的一草一木，植树造林，还要保护好自然景观，小明同学的哪些做法需要改正（    ）

①每年都和父母参与义务植树活动                ②每次都在风景区的景观上刻下“小明到此一游”

③为了节约时间，每次都穿过草坪去教室    ④在爬荒山的时候，每次都把垃圾整理好带下山

阅读下列材料，回答问题。

    A new research on students' sleeping habits says that more than 70% of students do not get enough sleep.

    Researchers found that primary school students get 9 hours and 10 minutes of sleep a night, junior high school students get 8 hours and 6 minutes, and senior high school students get 7 hours and 9 minutes. None of those hours are enough for each group. Not enough sleep can cause many kinds of problems in children and teenagers.

    In 2007, Shanghai Municipal Education Commission asked primary and middle schools in the city to adjust their timetables so that students could get more sleep. Two years later, a research found that students at schools that adjusted their timetables got more sleep than in 2005.

    The researchers hope that the government will take measures to make students have enough sleep. Students in other places may even less sleep than those in Shanghai.

我国某地一寺庙佛门子弟积极参加当地公益活动，方丈还以80万元巨资买到了电视台黄金时段前15秒公益广告权，宣传保护野生动物。以上事实说明，在我国（   ）。