科技英语课后答案.doc

第一章科技英语阅读第一节科技英语主要特点 . The first three sentences in Passage One are all constructed with passive voice while the first three sentences in Passage Two are constructed with active voice. Therefore, the language in Passage One sounds more formal and objective than that of Passage Two. 2. The words spoken by Sheila in Passage Two are informal. Examples: "There's Ravi at the home of that American doctor." (Contracted form); "A wonderful guy." (plete sentence); "Ravi looks sweet, doesn 't he?" (Question tag). 3. In the second paragraph of Passage One, "it" refers to "to use insecticide regularly, ona very large scale." 4. In the second paragraph of Passage Two, "through" means "finish" or "complete." 5. Passage One is written for academic purpose and Passage Two mainly for entertainment. II. Passage One A blast ofhot air is sent into the bottom of the furnace to make the coke burn fiercely. It is blown into the furnace through pipes. These pipes are installed around the circumference of the blast furnace eight feet above the bottom. While the coke is burning and iron is melting , gas is formed at the top of the chamber. This is led off from the top of the furnace tobe used. It contains carbon monoxide, which bustible . Part of this gas is used for making the air blast hot. It is led off into stoves. Passage Two All elements posed of discrete units called atoms, which are the smallest particles that exhibit the characteristics of the element. Atoms are tiny units of posed of positively charged protons, negatively charged electrons, and electrically neutral neutrons. Protons and neutrons, which have approximately the same mass, are clustered in the nucleus in the center of the atom. Electrons, which are tiny parison to the other units, orbit the nucleus at high speed. Atoms that have an equal number of electrons and protons are electrically neutral. Those that have gained or lost electrons, and therefore are positively or negatively charged, are called ions. 第二节科技、半科技英语专