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1、预习检测漂浮漂浮漂浮漂浮floatfloat重力重力重力重力gravitygravity虚弱的虚弱的weakweak虚弱的虚弱的能够能够能够能够ableable系，捆系，捆系，捆tie没有没有没有没有without我们自己我们自己我们自己我们自己ourselvesourselvesAnswer the questions according to the second paragraph.The Moon is around 380,000 kilometres from the Earth, so The Moon is around 380,000 kilometres from the
2、Earth, so itll take us about four days to get there. Theres no itll take us about four days to get there. Theres no gravitygravity in space, so well all be able to in space, so well all be able to floatfloat around in the around in the spaceship. Well have to spaceship. Well have to tietie ourselves
3、ourselves to our beds to our beds so so thatthat we wont float away in our sleep! we wont float away in our sleep! WithoutWithout gravity, gravity, our bodies may get our bodies may get weakweak , so well have to do exercises , so well have to do exercises every day. every day. 1.Its around 380,000
4、kilometers from the Earth. 2.About four days. 3.Because theres no gravity in space. 4.Because without gravity, their bodies may get weak. 2.Itll take us about four days to get there.It will take sb. some time to do sth.= sb. will spend some time (in) doing sth.本句的同义句为：本句的同义句为： We will spend about fo
5、ur days getting there.4. be able to 和 can 的区别can和和 be able to 都可用来表示能力，都可用来表示能力，can情态动词，情态动词， 侧重强调本身具备的能力。侧重强调本身具备的能力。 be able to ，普通动词短语，侧重强调通，普通动词短语，侧重强调通过努力获得的能力，而且过努力获得的能力，而且can 只有只有 can 和和could两种形式两种形式 be able to则有多种形则有多种形式，主要体现在式，主要体现在be动词的变化上。动词的变化上。5.Well have to tie ourselves to our beds so that we wont float away in our sleep.so that 表示表示 “为了；以便为了；以便”。引导目的状。引导目的状语从句，相当于语从句，相当于in order that 和和in order to do. 1.完成书上60、61页相应练习题。2.背会本段课文。