13. english
　　1)常用句子
　　do you speak english?你会讲英语吗?
　　yes, a little.是的，会一点儿。
　　my native language is chinese.我的本族语是汉语。
　　how many languages do you speak?你会讲几种语言?
　　my friend speaks，reads and writes several languages.我的朋友会说、读、写几种语言。
　　i have a lot of trouble with pronunciation.我发音有很多困难。
　　he speaks french with an american accent.他讲法语带有美国口音。
　　my parents speak spanish fluently.我的父母西班牙语说得很流利。
　　his english is perfect.他的英语棒极了。
　　very often i make mistakes in grammar when i speak english.我老是在讲英语时犯语法错误。
　　his mother tongue is portuguese.他的母语是葡萄牙语。
　　once in a while i make mistakes in spelling.我偶尔出一些拼写错误。
　　he speaks japanese extremely well.他日语讲得好极了。
　　do you know how to speak russian?你知道怎样讲俄语吗?
　　martha knows italian well.玛莎意大利语很好。
　　2)常用对话
　　mr. green; do you speak japanese, mrs. brown?
　　mrs. brown: yes i do. i speak a little japanese.
　　mr. green: does your husband speak japanese, too?
　　mrs. brown; yes, a little. he speaks a little japanese.
　　mr. green: how well do you know french?
　　mrs. brown: pretty well. but i have a lot of trouble with spelling.
　　mr. green: how many languages do you speak?
　　mrs. brown: i speak four languages. how many do you sepak?
　　mr. green: i speak three languages. i don’t speak japanese.
　　mrs. brown: what language do you speak?
　　mr. green: i speak french, greek, arabic and english.
　　mrs. brown: do you read and write those languages?
　　mr. green: yes, i do. but sometimes i make mistakes in spelling.
　　mrs. brown: so do i.

　　14. subjects
　　常用句子
　　what courses are you planning to take?你打算修些什么课程?
　　i’m thinking of taking the course in modern american literature.我在考虑选修现代美国文学。
　　what field do you major in?你主修哪个方面?
　　i major in science.我主修自然科学。
　　what’s your major?你的主修科目是什么?
　　i take world history as my major.我以世界历史为我的主修专业。
　　what subject are you studying?你学的是什么专业?
　　i’m doing modern languages.我在学现代语言。
　　what did you specialize in?你主修什么?
　　in college i specialize in organic chemistry.在学院里我主修有机化学。
　　i expect to take the linguistic course.我将修语言学课程。
　　i’m an economics major.我是经济学专业的学生。
　　i’m going to attend the lectures given by prof.johnson.我打算去听约翰逊教授的讲座。
　　i’m going to harvard university to do postgraduate work in medicine.
　　我打算去哈佛大学读医学研究生。
　　i’m taking economics and mathematics.我在攻读经济学和数学。

　　15.popular science
　　常用句子
　　when we heat anything，it expands.当我们给物体加热它就膨胀。
　　this wire inside an electric lamp is not made of copper but it is made of tungsten.
　　电灯里面的细丝不是铜丝而是钨丝。
　　light travels very fast.it moves at 186，300 miles a second，that is 300，000 kilometers a second
　　光速很快，每秒可行十八万六千三百英里，即三十万公里。
　　a ray of light usually travels in a straight line;but sometimes it bends.it leaves the air and goes into the glass，then it bends.一束光线通常走直线，但有时也弯曲，当离开空气进入玻璃时，它就弯曲。
　　hydrogen burns easily in oxygen or in air.氢气在氧气或空气中易燃。
　　the earth is one of the nine planets.地球是九大行星之一。
　　each of the nine planets turns on its own axis.they all go around the sun the same way.
　　九大行星都自转，它们又都围着太阳按同一方向转动。
　　why does the earth always move round the sun and not fly off into cold space?the sun’s gravitation gives the answer为什么地球一直围太阳转而脱离不到太空去呢?太阳的牵引力能解释这个问题。
　　a vacuum is a space with nothing in it.真空是指不包含任何东西的空间。
　　aristotle said that heavy things fall faster than light things，but he was wrong.
　　亚里士多德说重的物体比轻的物体降落快，但他错了。
　　some countries have large numbers of earthquakes.japan is one of them.
　　有些国家地震频繁。日本是其中之一。
　　i’m very poor at physics, but kate is good at it.我对物理一窍不通，但凯特很在行。
　　i don’t like electricity，but i’m interested in the law of universal gravitation.
　　我讨厌电学，但我对万有引力定律感兴趣。
　　which is faster，sound or light?哪一个快，声还是光?
　　i think physics is the most important subject.我认为物理学是最重要的科目。