大学英语（第三册）unit3.ppt

Teaching Plan Teaching Steps 1. Warming-up 2. Global Analysis 3. Language Study 4. After-Text Exercises 5. Writing-Practice 6. Homework Teaching Plan Objectives: Students will be able to: 1. grasp the main idea (America is deteriorating into “ the most insecure nation” ) and the structure of the text (opening—body—conclusion); 2. learn to use comparison and contrast in writing and to use keywords for efficient reading; 3.master the key language points and grammatical structures in the text; 4. conduct a series of reading, listening, speaking and writing activities related to the theme of the unit. Teaching Steps1.Warming-up ⑴What is LOCK? Mechanical devices Lock (device), a mechanical device used to secure possessions, can be used with keys or number locks. Lock (firearm), the ignition mechanism of small arms. Lock (water transport), an enclosure in a navigable canal or river which enables ships and boats to pass between sections of the waterway at different levels Teaching Steps1.Warming-up ⑴What is LOCK? Technology Lock (computer science), a bookkeeping object associated with a piece of data that is used to serialize concurrent access Lock (database), a feature used when multiple users access a database concurrently Lock (weapons guidance), an indication the missile seeker system has a suitable or adequate acquisition fix to hit successfully if launched SIM lock, a feature that restricts a mobile phone to only work in certain countries or with certain providers Teaching Steps1.Warming-up ⑵Hold a discussion within students to see what equipment we usually use to keep us safe. Teaching Steps1.Warming-up ⑶Lead in to Text A by saying：Once upon a time in China, no one picked up and pocketed anything left on the road, while no family had the need to bolt the doors at night. However, this is no longer true nowadays. The same change has taken place in the US. Let’s see how insecure a nation the US has become. Teaching Steps2. Global Analysis ⑴Scan the t