Text Completion

　　Directions: In this part there are three short texts. For each text , you should first fill in the blank in the choices A, B, C (and D) with the best answer provided in the rectangle. Then, complete the text itself by filling in each o f the blanks with the completed A, or B, or C (or D).Write your answer on the Answer sheet

　　A. When large concentrations of these substances are (1)______

　　B. ( 2) _____ energy generation

　　C. that are (3) _____in air

　　The main sources of air pollution are the industries, agriculture and traffic, (4)_____.During combustion processes and other production processes air pollutants are emitted. Some of these substances are not directly damaging to air quality, but will form harmful air pollutants by reactions with other substances (5)______.

　　Examples of large-scale air pollutants are volatile (揮發(fā)性的) organic compounds and small dust particles. ( 6) _____,this negatively affects environment, materials and public health.

　　答案解析：

　　這是一篇小短文，內(nèi)容非常簡(jiǎn)單1---3題不用看全文內(nèi)容，僅憑語(yǔ)法和搭配知識(shí)就可以完成。

　　第1題填emitted，因?yàn)檫@里需要一個(gè)過(guò)去分詞表示被動(dòng)語(yǔ)態(tài)。

　　第2題填as well as，因?yàn)閑nergy generation前面列舉的都是名詞，as well as表示并列關(guān)系。

　　第3題填present，因?yàn)榍懊媸窍祫?dòng)詞are，這里要用形容詞做表語(yǔ)。

　　從上下文內(nèi)容看第4題答案是B;第5題答案是C;第6題答案是A。