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閱讀Article: pine tree forests 可以被自然的保護(hù)。1.冬天天氣冷,pine beetles(吃這種樹(shù)的蟲(chóng)子)數(shù)量很少 2.Pine tree本身可以flush out beetles with wap 3.蟲(chóng)子支持老樹(shù),對(duì)young tree 不感興趣。
綜合寫(xiě)作Lecture: 主要是人為原因 1.Human activities 導(dǎo)致氣候變暖,冬天蟲(chóng)子數(shù)量大增
2.Pine tree的這種本領(lǐng)需要水,但是ground water is low 因?yàn)槿藶橐蛩?,所以這種功能不能發(fā)揮出來(lái)3. 人類(lèi)FARM導(dǎo)致現(xiàn)在只有很少的young tree, 所以pine tree forests 恢復(fù)能力很差。
獨(dú)立寫(xiě)作Can two people be good friends if one people has more money than the other?