灾害 in the past hundred years, there have heen frequent natural disasters, such as floods, droughts, mud-rock flows, seismic sea waves, earthquakes, windstorms and the stretching of new deserts.
the disasters have killed millions upon millions of people, destroyed countless homes, and wiped out numerous pieces of fertile land.
now more and more people become aware that those disasters have much to do with what we have done to the earth. we have cut down too many trees in the forests,we have badly polluted the environment, we have shocked our own home-planet time and again with tremendously powerful explosions of nuclear bombs.
as a result, climates have become abnormal, rainwater rushes down hillsides angrily, and the underground energy goes up to revenge itself on us.
the earth is our only home-planet. it is urgent for us to stop damaging it, and to do our best to protect it and make it a lovely place suitable to live in, for we have nowhere to go and survive except where we are now.
关系副词引导的定语从句
引导名词性从句的连接词
must表示推测
牛津实用英语语法 名词的性
if, whether引导的名词从句
比较so和 such
as, which 非限定性定语从句
表示"一…就…"的结构
否定转移
名词性wh
表原因关系
牛津实用英语语法 a/an(不定冠词)
谓语需用单数
wish的用法
牛津实用英语语法 32 far,farther/farthest和further/furthest
比较while, when, as
比较have to和must
关系代词that 的用法
need "不必做"和"本不该做"
原因状语从句
非真实条件句
并列结构作主语时谓语用复数
would rather表示"宁愿"
牛津实用英语语法 a little/a few和 little/few
比较until和till
牛津实用英语语法 22 than/as+代词+助动词
比较need和dare
名词性that
牛津实用英语语法 23 the+形容词
带to 的情态动词
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